self-hosting guide (#121)

* docs: first steps of the self-hosting guide

* feature: add setup configurator for the self-hosted guide

* docs: add setup.env comments

* docs: simplify installation steps - support ./configure.sh

* docs: fix file references

* docs: fix minor docs issues

* docs: remove unused title

infrastructure_files/configure.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+unset $(grep -v '^#' ./setup.env | sed -E 's/(.*)=.*/\1/' | xargs)
+export $(grep -v '^#' ./setup.env | xargs)
+
+envsubst < docker-compose.yml.tmpl > docker-compose.yml
+envsubst < management.json.tmpl > management.json