docs: restructure docs (#14421)

Closes #13434 
Supersedes #14182

---------

Co-authored-by: Ethan <39577870+ethanndickson@users.noreply.github.com>
Co-authored-by: Ethan Dickson <ethan@coder.com>
Co-authored-by: Ben Potter <ben@coder.com>
Co-authored-by: Stephen Kirby <58410745+stirby@users.noreply.github.com>
Co-authored-by: Stephen Kirby <me@skirby.dev>
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>

docs/admin/setup/web-server/apache/coder.conf

@@ -0,0 +1,28 @@
+ # Redirect HTTP to HTTPS
+ <VirtualHost *:80>
+     ServerName coder.example.com
+     ServerAlias *.coder.example.com
+     Redirect permanent / https://coder.example.com/
+ </VirtualHost>
+
+ <VirtualHost *:443>
+     ServerName coder.example.com
+     ServerAlias *.coder.example.com
+     ErrorLog ${APACHE_LOG_DIR}/error.log
+     CustomLog ${APACHE_LOG_DIR}/access.log combined
+
+     ProxyPass / http://127.0.0.1:3000/ upgrade=any # required for websockets
+     ProxyPassReverse / http://127.0.0.1:3000/
+     ProxyRequests Off
+     ProxyPreserveHost On
+
+     RewriteEngine On
+     # Websockets are required for workspace connectivity
+     RewriteCond %{HTTP:Connection} Upgrade [NC]
+     RewriteCond %{HTTP:Upgrade} websocket [NC]
+     RewriteRule /(.*) ws://127.0.0.1:3000/$1 [P,L]
+
+     SSLCertificateFile /etc/letsencrypt/live/coder.example.com/fullchain.pem
+     SSLCertificateKeyFile /etc/letsencrypt/live/coder.example.com/privkey.pem
+ </VirtualHost>
+