Move version and changelog to files (#1109)

Move these assets to files so that they can be replaced with generated
assets in the future.

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/client/index.html

@@ -155,7 +155,9 @@
             />
           </g>
         </svg>
-        <div class="l-header__highlightText">v23.16</div>
+        <div id="game-version" class="l-header__highlightText">
+          Loading version...
+        </div>
       </div>
     </header>
     <div class="bg-image"></div>