refactor(posts): remove replit.com demos and references

Remove Replit demos, links, and iframes from 37 blog posts.

The Replit service is no longer a viable demo platform.

Author: remarkablemark

_posts/2016/2016-09-22-webpack-build-umd.md

@@ -126,9 +126,3 @@ Load module with [script tag](https://www.html5rocks.com/en/tutorials/speed/scri
   });
 </script>
 ```
-
-## Demo
-
-[Replit](https://replit.com/@remarkablemark/webpack-umd):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/webpack-umd?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

_posts/2017/2017-01-17-minimal-express-server.md

@@ -89,13 +89,3 @@ app.get('/', (req, res, next) => {
 const port = process.env.PORT || 3000;
 app.listen(port, () => console.log(`Listening on port ${port}`));
 ```
-
-## Demo
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/express?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>
-
-The [Replit](https://replit.com/@remarkablemark/express) demo includes:
-
-- [morgan](https://www.npmjs.com/package/morgan) (HTTP request logger)
-- route not found (404 error)
-- error handling (500 internal server error)

_posts/2017/2017-05-07-hot-module-replacement.md

@@ -108,12 +108,6 @@ Run `webpack-dev-server` without passing any options:
 npx webpack serve
 ```
 
-## Demo
-
-[Replit](https://replit.com/@remarkablemark/webpack-dev-server-hot-module-replacement):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/webpack-dev-server-hot-module-replacement?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>
-
 ## Resources
 
 - [Hot Module Replacement](https://survivejs.com/webpack/appendices/hmr/)

_posts/2019/2019-09-28-javascript-remove-punctuation.md

@@ -24,7 +24,7 @@ To remove punctuation with JavaScript, you can _iterate_ through each letter and
 var rawString = 'Hello, world!';
 
 var rawLetters = rawString.split('');
-var cleanLetters = rawLetters.filter(function(letter) {
+var cleanLetters = rawLetters.filter(function (letter) {
   return punctuation.indexOf(letter) === -1;
 });
 
@@ -39,7 +39,7 @@ var punctuation = '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~';
 function removePunctuation(string) {
   return string
     .split('')
-    .filter(function(letter) {
+    .filter(function (letter) {
       return punctuation.indexOf(letter) === -1;
     })
     .join('');
@@ -78,12 +78,6 @@ function removePunctuation(string) {
 }
 ```
 
-## Demo
-
-See [Replit](https://replit.com/@remarkablemark/Remove-punctuation) demo:
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/Remove-punctuation?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>
-
 You can also find the code in this [Gist](https://gist.github.com/remarkablemark/6ef2779bee9d98bcfdc1fef2300f0476).
 
 <!--/email_off-->

_posts/2020/2020-01-12-eslint-sort-imports.md

@@ -21,7 +21,6 @@ This article goes over how to **sort imports** with [ESLint](https://eslint.org/
 - [Solution](#solution)
   - [sort-imports](#sort-imports)
   - [eslint-plugin-simple-import-sort](#eslint-plugin-simple-import-sort)
-- [Demo](#demo)
 
 </details>
 </p>
@@ -286,9 +285,3 @@ import foo from './foo';
 ```
 
 Congratulations! You've set up import sorting with ESLint.
-
-## Demo
-
-[Replit](https://replit.com/@remarkablemark/eslint-sort-imports#.eslintrc.json) example:
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/eslint-sort-imports?lite=true#.eslintrc.json" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

_posts/2020/2020-05-11-texsvg.md

@@ -44,10 +44,6 @@ npx texsvg '\frac{a}{b}' fraction.svg # texsvg <tex> <file>
 
 The examples below were built with [texsvg-server](https://github.com/remarkablemark/texsvg-server).
 
-[Quadratic formula](https://texsvg-server-github.remarkablemark.repl.co/?tex=x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}):
-
-![x equals begin fraction negative b plus or minus begin square root b squared minus 4 times a times c end square root over 2 times a end fraction](https://texsvg-server-github.remarkablemark.repl.co/?tex=x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} 'Quadratic Formula')
-
 [JSFiddle](https://jsfiddle.net/remarkablemark/1k7t6s9o/):
 
 <script async src="https://jsfiddle.net/remarkablemark/1k7t6s9o/embed/result/"></script>

_posts/2020/2020-06-25-php-date-time-format.md

@@ -85,9 +85,3 @@ Here are some examples of using shorthand constants:
 echo date('c', strtotime('now')); // ISO8601
 echo (new DateTime())->format('r'); // RFC2822
 ```
-
-## Demo
-
-Check out the following [Replit](https://replit.com/@remarkablemark/PHP-date):
-
-<iframe height="800px" width="100%" src="https://replit.com/@remarkablemark/PHP-date?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

_posts/2020/2020-07-14-call-private-protected-php-method.md

@@ -72,9 +72,3 @@ This means you can call `Foo::bar`:
 ```php
 callObjectMethod(new Foo(), 'bar'); // 'baz'
 ```
-
-## Demo
-
-See [Replit](https://replit.com/@remarkablemark/PHP-call-private-method):
-
-<iframe height="800px" width="100%" src="https://replit.com/@remarkablemark/PHP-call-private-method?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

_posts/2020/2020-07-30-php-benchmark-function.md

@@ -86,9 +86,3 @@ myFunction();
 echo number_format(benchmark('myFunction'), 3); // 1.000
 echo number_format(benchmark('myFunction', true), 3); // 0.000
 ```
-
-## Demo
-
-Check out the [Replit](https://replit.com/@remarkablemark/PHP-benchmark-function) of the advanced function:
-
-<iframe height="800px" width="100%" src="https://replit.com/@remarkablemark/PHP-benchmark-function?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>

_posts/2020/2020-08-24-python-speech-recognition.md

@@ -68,15 +68,7 @@ python speech_to_text.py # hello world
 | Fairly accurate | Transcript can be off                                                |
 |                 | No punctuation marks                                                 |
 
-See [guide](https://realpython.com/python-speech-recognition/) for more details.
-
-### Demo
-
-[Replit](https://replit.com/@remarkablemark/Speech-Recognition):
-
-<iframe height="550px" width="100%" src="https://replit.com/@remarkablemark/Speech-Recognition?lite=true" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>
-
-See [GitHub repository](https://github.com/remarkablemark/speech-recognition-demo) for more details.
+See [guide](https://realpython.com/python-speech-recognition/) and [GitHub repository](https://github.com/remarkablemark/speech-recognition-demo) for more details.
 
 ## Web Speech API