fix(api): Add href to protected attributes

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2312>

api/funkwhale_api/common/utils.py

@@ -308,7 +308,7 @@ HTMl_CLEANER = bleach.sanitizer.Cleaner(strip=True, tags=SAFE_TAGS)
 HTML_PERMISSIVE_CLEANER = bleach.sanitizer.Cleaner(
     strip=True,
     tags=SAFE_TAGS + ["h1", "h2", "h3", "h4", "h5", "h6", "div", "section", "article"],
-    attributes=["class", "rel", "alt", "title"],
+    attributes=["class", "rel", "alt", "title", "href"],
 )
 
 # support for additional tlds

changes/changelog.d/2023.bugfix

@@ -0,0 +1 @@
+Fixed an issue which caused links in Markdown forms to not render correctly. (#2023)