Add `tenant.AllowedSchemes` advanced configuration item (getfider#1332)

* Add tenant.AllowedSchemes advanced configuration item

Specifying ^monero:[48] or ^bitcoin:(1|3|bc1) allows cryptocurrency
payment links

These were rendered but then sanitised away to <a>...</a> w/o href=

Ref: https://bounties.monero.social/posts/15/1-200m-monero-bounties-site-parse-donation-address-as-link

* Ship the config via useFider()

* Work around useContext() restrixion in test

* Disable allowed schemes by setting ALLOW_ALLOWED_SCHEMES=false

* Hide Allowed URL Schemes config if disabled

* Bump migration date

Share feedback fixes (getfider#1340)

* Only show pending post once, and no "code" in querystring

* No share feedback if you're readOnly

Updated translations

Signin modal update. (getfider#1275)

* Started on the signin modal

* More signin modal stuff

* More signin stuff

* Minor changes to the css for the signin modal

* Show theme switcher when not logged in

* Fixed tests with localStorage and SSR

* Fixed the theme switcher stuff for the SSR

* Updated strings from crowdin

* Convert to functional comnponent

Fix ssr rendering issues for the show post page.

Merge pull request getfider#1219 from getfider/Italian

Language translations - Italian and Chinese

Merge pull request getfider#1215 from kimtiago/dockerfile

Update Markdown dependency and Dockerfile to Debian Bookworm / Node.js 22

Wasn't picking up the tag name properly

fix: return absolute url for assets

chore: sync from crowdin