516 compatibility for browsers (#20652)

this is a bit of

https://github.com/cmss13-devs/cmss13/pull/8646
https://github.com/cmss13-devs/cmss13/pull/8875
https://github.com/cmss13-devs/cmss13/pull/8606
https://github.com/cmss13-devs/cmss13/pull/8607
https://github.com/cmss13-devs/cmss13/pull/8359
https://github.com/cmss13-devs/cmss13/pull/7860
( and thus https://github.com/ParadiseSS13/Paradise/pull/25105
https://github.com/ParadiseSS13/Paradise/pull/25205
https://github.com/ParadiseSS13/Paradise/pull/25363
https://github.com/ParadiseSS13/Paradise/pull/26423 and
https://github.com/ParadiseSS13/Paradise/pull/26433 )
https://github.com/tgstation/tgstation/pull/89766

in order to work properly - using the efficient storage method, instead
of the byond json method - github pages needs to be enabled and built
from the gh-pages branch. because yeah

---------

Co-authored-by: harryob <55142896+harryob@users.noreply.github.com>

.github/workflows/generate_web_assets.yml

@@ -0,0 +1,23 @@
+name: Generate web assets
+on:
+  push:
+    branches:
+    - master
+jobs:
+  generate_static_assets:
+    if: ( !contains(github.event.head_commit.message, '[ci skip]') )
+    runs-on: ubuntu-latest
+    concurrency: gen-assets
+    steps:
+      - uses: actions/checkout@v3
+      - name: Generate static assets
+        run: |
+          mv tgui/public/ assets
+      - name: Deploy
+        uses: JamesIves/github-pages-deploy-action@3.7.1
+        with:
+          BRANCH: gh-pages
+          CLEAN: true
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SINGLE_COMMIT: true
+          FOLDER: assets