more docs help

docker/README.md

@@ -2,4 +2,12 @@
 
 * [Setting up a new Pixelfed server with Docker Compose](new-server.md)
 * [Understanding Pixelfed Container runtimes (Apache, FPM, Nginx + FPM)](runtimes.md)
+  * [Apache](runtimes.md#apache)
+  * [FPM](runtimes.md#fpm)
+  * [Nginx + FPM](runtimes.md#nginx)
 * [Customizing Docker image](customizing.md)
+  * [Running commands on container start](customizing.md#running-commands-on-container-start)
+  * [Disabling entrypoint or individual scripts](customizing.md#disabling-entrypoint-or-individual-scripts)
+  * [Templating](customizing.md#templating)
+  * [Fixing ownership on startup](customizing.md#fixing-ownership-on-startup)
+  * [Build settings (arguments)](customizing.md#build-settings-arguments)