fix(posts): remove 404 replit links

* At _site/blog/2020/05/11/texsvg/index.html:174:

  External link https://replit.com/@remarkablemark/texsvg-server-GitHub#package.json failed (status code 404)

* At _site/blog/2020/09/26/python-phpserialize/index.html:211:

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* At _site/blog/2021/03/31/nodejs-download-file/index.html:174:

  External link https://replit.com/@remarkablemark/node-fetch-mp4#index.js failed (status code 404)

* At _site/blog/2021/04/16/create-stopwatch-with-html-javascript/index.html:223:

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* At _site/blog/2021/08/29/javascript-generate-sha-256-hexadecimal-hash/index.html:195:

  External link https://replit.com/@remarkablemark/JavaScript-SHA-256-hash#index.html failed (status code 404)

* At _site/blog/2022/12/27/bash-curl-google-sheets-csv/index.html:186:

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Author: remarkablemark

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

@@ -48,10 +48,6 @@ The examples below were built with [texsvg-server](https://github.com/remarkable
 
 ![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')
 
-[Replit](https://replit.com/@remarkablemark/texsvg-server-GitHub#package.json):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/texsvg-server-GitHub?lite=true#package.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>
-
 [JSFiddle](https://jsfiddle.net/remarkablemark/1k7t6s9o/):
 
 <script async src="https://jsfiddle.net/remarkablemark/1k7t6s9o/embed/result/"></script>

_posts/2020/2020-09-26-python-phpserialize.md

@@ -89,9 +89,3 @@ output = {
 }
 print(output) # {'baz': 'qux'}
 ```
-
-## Demo
-
-[Replit](https://replit.com/@remarkablemark/Python-phpserialize):
-
-<iframe height="800px" width="100%" src="https://replit.com/@remarkablemark/Python-phpserialize?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/2021/2021-03-31-nodejs-download-file.md

@@ -47,9 +47,3 @@ Run the script to download the MP4:
 ```sh
 node index.js
 ```
-
-## Demo
-
-[Replit](https://replit.com/@remarkablemark/node-fetch-mp4#index.js):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/node-fetch-mp4?lite=true#index.js" 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/2021/2021-04-16-create-stopwatch-with-html-javascript.md

@@ -96,9 +96,3 @@ Update `index.html` to create the worker and listen to [`onmessage`](https://dev
   };
 </script>
 ```
-
-## Demo
-
-Check out the [GitHub repository](https://github.com/remarkablemark/stopwatch) or [Replit](https://replit.com/@remarkablemark/Stopwatch#index.html):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/Stopwatch?lite=true#index.html" 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/2021/2021-08-29-javascript-generate-sha-256-hexadecimal-hash.md

@@ -29,10 +29,6 @@ Usage:
 console.log(hash('foo')); // '2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae'
 ```
 
-[Demo](https://replit.com/@remarkablemark/Nodejs-SHA-256-hash#index.js):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/Nodejs-SHA-256-hash?lite=true#index.js" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>
-
 ## Browser
 
 To generate a SHA-256 hash in the browser using [SubtleCrypto](https://developer.mozilla.org/docs/Web/API/SubtleCrypto/digest#converting_a_digest_to_a_hex_string):
@@ -69,7 +65,3 @@ Usage:
 ```js
 hash('foo').then((hex) => console.log(hex)); // '2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae'
 ```
-
-[Demo](https://replit.com/@remarkablemark/JavaScript-SHA-256-hash#index.html):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/JavaScript-SHA-256-hash?lite=true#index.html" 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/2022/2022-12-27-bash-curl-google-sheets-csv.md

@@ -62,7 +62,3 @@ SHEET_ID='1OiuuC_WrDCRfhnYX9i9BJ75-F0frFuSkAIYOgf-Qf6I'
 URL="https://docs.google.com/spreadsheets/d/$SHEET_ID/export?exportFormat=csv"
 curl -L $URL -o my_sheet.csv
 ```
-
-[Replit](https://replit.com/@remarkablemark/Bash-cURL-Google-Sheets#main.sh):
-
-<iframe height="400px" width="100%" src="https://replit.com/@remarkablemark/Bash-cURL-Google-Sheets?lite=true#main.sh" scrolling="no" frameborder="no" allowtransparency="true" allowfullscreen="true" sandbox="allow-forms allow-pointer-lock allow-popups allow-same-origin allow-scripts allow-modals"></iframe>