Merge commit 'c76ae7a5c0d247264afa896f081db9d1fd278711' into glitch-soc/merge-upstream

Conflicts:
- `app/javascript/packs/public.jsx`:
  In glitch-soc, this file was split across the following files:
  - `app/javascript/packs/public.jsx`
  - `app/javascript/core/embed.js`
  - `app/javascript/core/settings.js`
  Update all those files accordingly, as well as the related `theme.yml` files.

app/javascript/flavours/vanilla/theme.yml

@@ -2,12 +2,12 @@
 pack:
   admin:
     - admin.tsx
-    - public.jsx
-  auth: public.jsx
+    - public.tsx
+  auth: public.tsx
   common:
     filename: common.js
     stylesheet: true
-  embed: public.jsx
+  embed: public.tsx
   error: error.js
   home:
     filename: application.js
@@ -17,8 +17,8 @@ pack:
       - features/notifications
   mailer:
   modal:
-  public: public.jsx
-  settings: public.jsx
+  public: public.tsx
+  settings: public.tsx
   sign_up: sign_up.js
   share: share.jsx