Describe target audiences

Since we have different types of documentation I consider it helpful to
have a one-liner explaining who we want to reach with each part.

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

v1.19/admin/index.md

@@ -3,11 +3,13 @@ layout: '~/layouts/Markdown.astro'
 title: 'Forgejo v1.19 administrator guide'
 ---
 
-* [Configuration Cheat Sheet](config-cheat-sheet)
-* [Upgrade guide](upgrade)
-* [Command Line](command-line)
-* [Reverse Proxy](reverse-proxy)
-* [Email setup](email-setup)
-* [Incoming Email](incoming-email)
-* [Logging Configuration](logging-documentation)
-* [Packages](packages)
+These documents are targeted to people who run Forgejo on their machines.
+
+- [Configuration Cheat Sheet](config-cheat-sheet)
+- [Upgrade guide](upgrade)
+- [Command Line](command-line)
+- [Reverse Proxy](reverse-proxy)
+- [Email setup](email-setup)
+- [Incoming Email](incoming-email)
+- [Logging Configuration](logging-documentation)
+- [Packages](packages)

v1.19/developer/index.md

@@ -3,3 +3,5 @@ layout: '~/layouts/Markdown.astro'
 title: 'Forgejo v1.19 developer guide'
 ---
 
+This area will be targeted to people who want to hack Forgejo and adjust it to
+their needs. Please stay tuned.

v1.19/user/index.md

@@ -3,9 +3,12 @@ layout: '~/layouts/Markdown.astro'
 title: 'Forgejo v1.19 user guide'
 ---
 
-* [Your First Repository](first-repository)
-* Authentication
-  * [LDAP, PAM, FreeIPA](authentication)
-  * [OAuth2, Scoped Tokens, Client Types](oauth2-provider)
-* [API Usage](api-usage)
-* [API Reference](https://codeberg.org/api/swagger)
+These documents are targeted to people who are using Forgejo but are not
+involved in running it on their machines.
+
+- [Your First Repository](first-repository)
+- Authentication
+  - [LDAP, PAM, FreeIPA](authentication)
+  - [OAuth2, Scoped Tokens, Client Types](oauth2-provider)
+- [API Usage](api-usage)
+- [API Reference](https://codeberg.org/api/swagger)