chore(gitea): improve article

knowledge base/gitea.md

@@ -1,10 +1,25 @@
 # Gitea
 
+1. [Installation](#installation)
 1. [Further readings](#further-readings)
 
+## Installation
+
+The `git` user has UID and GID set to 1000 by default.<br/>
+Change those in the compose file or whatever.
+
+One can optionally define the administrative user during the initial setup.<br/>
+If no administrative user is defined in that moment, the first registered user becomes the administrator.
+
 ## Further readings
 
 - [Website]
+- [Compose file]
+- [Git]
+
+Alternatives:
+
+- [Gitlab]
 
 <!--
   Reference
@@ -13,7 +28,12 @@
 
 <!-- In-article sections -->
 <!-- Knowledge base -->
+[git]: git.md
+[gitlab]: gitlab.md
+
 <!-- Files -->
+[compose file]: /docker/gitea/docker-compose.yml
+
 <!-- Upstream -->
 [website]: https://about.gitea.com/
 

snippets/gitea.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+docker exec -ti 'gitea-server-1' sh