Update default version number (#1218)

## Description:

Update the default version number displayed on openfront.dev builds.

## Please complete the following:

- [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>

resources/version.txt

@@ -1 +1,2 @@
-v0.24.0-dev
+EXPERIMENTAL BUILD
+FOR INTERNAL USE ONLY

src/client/index.html

@@ -155,7 +155,7 @@
             />
           </g>
         </svg>
-        <div id="game-version" class="l-header__highlightText">
+        <div id="game-version" class="l-header__highlightText text-center">
           Loading version...
         </div>
       </div>