docs: docs website + installation (#778)

* feat: WIP doc (vibe started and iterated)

* install from scratch docs

* caddyfile.example

* gitignore

* authentik script

* authentik script

* authentik script

* llm doc

* authentik ongoing

* more daily setup logs

* doc website

* gpu self hosted setup guide (no-mistakes)

* doc review round

* doc review round

* doc review round

* update doc site sidebars

* feat(docs): add mermaid diagram support

* docs polishing

* live pipeline doc

* move pipeline dev docs to dev docs location

* doc pr review iteration

* dockerfile healthcheck

* docs/pr-comments

* remove jwt comment

* llm suggestion

* pr comments

* pr comments

* document auto migrations

* cleanup docs

---------

Co-authored-by: Mathieu Virbel <mat@meltingrocks.com>
Co-authored-by: Igor Loskutov <igor.loskutoff@gmail.com>

Caddyfile.example

@@ -0,0 +1,22 @@
+# Reflector Caddyfile
+# Replace example.com with your actual domains
+# CORS is handled by the backend - Caddy just proxies
+#
+# For environment variable substitution, set:
+#   FRONTEND_DOMAIN=app.example.com
+#   API_DOMAIN=api.example.com
+#   AUTHENTIK_DOMAIN=authentik.example.com  (optional, for authentication)
+# Or edit this file directly with your domains.
+
+{$FRONTEND_DOMAIN:app.example.com} {
+	reverse_proxy web:3000
+}
+
+{$API_DOMAIN:api.example.com} {
+	reverse_proxy server:1250
+}
+
+# Uncomment if using Authentik for authentication (see auth-setup.md)
+# {$AUTHENTIK_DOMAIN:authentik.example.com} {
+# 	reverse_proxy authentik-server-1:9000
+# }