Add Profile Readme for Organisations (#27955)

https://blog.gitea.com/release-of-1.20.0/#-user-profile-readme-23260
(#23260) did introduce Profile Readme for Users.

This makes it usable for Organisations:


![image](https://github.com/go-gitea/gitea/assets/24977596/464ab58b-a952-414b-8a34-6deaeb4f7d35)

---
*Sponsored by Kithara Software GmbH*

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>

templates/org/home.tmpl

@@ -38,6 +38,9 @@
 	<div class="ui container">
 		<div class="ui mobile reversed stackable grid">
 			<div class="ui {{if .ShowMemberAndTeamTab}}eleven wide{{end}} column">
+				{{if .ProfileReadme}}
+					<div id="readme_profile" class="markup">{{.ProfileReadme | Str2html}}</div>
+				{{end}}
 				{{template "explore/repo_search" .}}
 				{{template "explore/repo_list" .}}
 				{{template "base/paginate" .}}