Improve RSS feed icons (#28368)

- The RSS Feed icons were placed in a proper button, so that it does
  not look "inconsistent". This also makes the problem of the button
  being improperly aligned go away.
- The icon that shows on user profiles has not been modified because
  of a lack of better implementation ideas.
- Where applicable, the RSS Feed icon was put directly next to the
  Follow button (right menu), as both functionalities effectively
  share the same purpose.
- Despite the attempt at achieving less inconsistency, a conscious
  decision to not add any text to those buttons was made, opting for
  tooltips instead. "Make it present, but not too annoying."
- A special exception was made for the Releases pages (which contains
  text, not a tooltip), where an RSS feed would be particularly
  beneficial to users.

The fact that the RSS functionality is explicitly optional was taken
into account, and these improvements were made with public-facing
instances (where the feature works best) in mind.

templates/org/home.tmpl

@@ -9,9 +9,6 @@
 					{{if .Org.Visibility.IsLimited}}<span class="ui large basic horizontal label">{{ctx.Locale.Tr "org.settings.visibility.limited_shortname"}}</span>{{end}}
 					{{if .Org.Visibility.IsPrivate}}<span class="ui large basic horizontal label">{{ctx.Locale.Tr "org.settings.visibility.private_shortname"}}</span>{{end}}
 				</span>
-				{{if .EnableFeed}}
-					<a class="rss-icon gt-mx-3" href="{{.Org.HomeLink}}.rss" data-tooltip-content="{{ctx.Locale.Tr "rss_feed"}}">{{svg "octicon-rss" 24}}</a>
-				{{end}}
 			</div>
 			{{if $.RenderedDescription}}<div class="render-content markup">{{$.RenderedDescription|Str2html}}</div>{{end}}
 			<div class="text grey meta">
@@ -23,6 +20,11 @@
 			</div>
 		</div>
 		<div class="right menu">
+			{{if .EnableFeed}}
+			<button class="link-action ui basic label button gt-mr-0" data-tooltip-content="{{ctx.Locale.Tr "rss_feed"}}" data-url="{{$.Org.HomeLink}}.rss">
+				{{svg "octicon-rss" 24}}
+			</button>
+			{{end}}
 			<button class="link-action ui basic button gt-mr-0" data-url="{{.Org.HomeLink}}?action={{if $.IsFollowing}}unfollow{{else}}follow{{end}}">
 				{{if $.IsFollowing}}
 					{{ctx.Locale.Tr "user.unfollow"}}