Implement CSS-only input toggling, refactor related forms

UX/Translation changes:

- new teams: remove redundant tooltips that don't add meaningful information
  - move general information to table fieldset
- new teams: rename "general" to "custom" access for clarity
- new teams: show labels beside options on mobile

Accessibility:

- semantic form elements allow easier navigation (fieldset, mostly)
- improve better labelling of new teams table
- fix accessibility scan issues
- TODO: the parts that "disable" form elements were not yet touched and
  are not really accessible to screenreaders

Technical:

- replace two JavaScript solutions with one CSS standard
- implement a simpler grid (.simple-grid)
- simplify markup
- remove some webhook settings specific CSS

Testing:

- check more form content for accessibility issues
- but exclude tooltips from the scan :(
- reuse existing form tests from previous PR

web_src/js/index.js

@@ -60,7 +60,7 @@ import {
   initRepoSettingSearchTeamBox,
 } from './features/repo-settings.js';
 import {initRepoDiffView} from './features/repo-diff.js';
-import {initOrgTeamSearchRepoBox, initOrgTeamSettings} from './features/org-team.js';
+import {initOrgTeamSearchRepoBox} from './features/org-team.js';
 import {initUserAuthWebAuthn, initUserAuthWebAuthnRegister} from './features/user-auth-webauthn.js';
 import {initRepoRelease, initRepoReleaseNew} from './features/repo-release.js';
 import {initRepoEditor} from './features/repo-editor.js';
@@ -138,7 +138,6 @@ onDomReady(() => {
   initNotificationsTable();
 
   initOrgTeamSearchRepoBox();
-  initOrgTeamSettings();
 
   initRepoActivityTopAuthorsChart();
   initRepoArchiveLinks();