website: Change checkbox label to always show 'Show Alpha' (#200)

* Change checkbox label to always show 'Show Alpha'

* Invert checkbox checked state for alpha visibility

Author: nathaniel-furniss-glean

website/src/pages/colorful/index.tsx

@@ -17,8 +17,8 @@ function Example() {
       />
       <div>
         <label>
-          <input type="checkbox" checked={disableAlpha} onChange={(evn) => setDisableAlpha(evn.target.checked)} />
-          {disableAlpha ? 'Hide' : 'Show'} Alpha
+          <input type="checkbox" checked={!disableAlpha} onChange={(evn) => setDisableAlpha(evn.target.checked)} />
+          Show Alpha
         </label>
       </div>
     </div>