[feature] Add opt-in RSS feed for account's latest Public posts (#897)

* start adding rss functionality

* add gorilla/feeds dependency

* first bash at building rss feed
still needs work, this is an interim commit

* tidy up a bit

* add publicOnly option to GetAccountLastPosted

* implement rss endpoint

* fix test

* add initial user docs for rss

* update rss logo

* docs update

* add rssFeed to frontend

* feed -> feed.rss

* enableRSS

* increase rss logo size a lil bit

* add rss toggle

* move emojify to text package

* fiddle with rss feed formatting

* add Text field to test statuses

* move status to rss item to typeconverter

* update bun schema for enablerss

* simplify 304 checking

* assume account not rss

* update tests

* update swagger docs

* allow more characters in title, trim nicer

* update last posted to be more consistent

internal/web/profile.go

@@ -82,6 +82,11 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 		return
 	}
 
+	var rssFeed string
+	if account.EnableRSS {
+		rssFeed = "/@" + account.Username + "/feed.rss"
+	}
+
 	// only allow search engines / robots to view this page if account is discoverable
 	var robotsMeta string
 	if account.Discoverable {
@@ -118,6 +123,7 @@ func (m *Module) profileGETHandler(c *gin.Context) {
 		"instance":         instance,
 		"account":          account,
 		"ogMeta":           ogBase(instance).withAccount(account),
+		"rssFeed":          rssFeed,
 		"robotsMeta":       robotsMeta,
 		"statuses":         statusResp.Items,
 		"statuses_next":    statusResp.NextLink,