Add index.md for Getting Started section

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

docs/main/index.md

@@ -0,0 +1,11 @@
+Before installing Pi-hole, you need to make sure your system meets the [prerequisites](prerequisites.md) (hardware and operating system) and decide whether you want a [normal installation](basic-install.md) (bare metal) or a [docker installation](https://github.com/pi-hole/docker-pi-hole/).
+
+After the installation is complete, check the [Post-Install steps](post-install.md) to make sure your network is using Pi-hole.
+
+With the [`pihole` command](pihole-command.md), you can manually run Pi-hole commands, including [update Pi-hole](update.md).
+
+Alternatively, you can also use the [web interface](https://github.com/pi-hole/web/) to run and configure your Pi-hole.
+
+The web interface also allows you to use [Group Management](../group_management/index.md) functions to manage the relationship between clients, blocking rules, and allowing rules.
+
+If you need help, please visit our [Discourse Forum](https://discourse.pi-hole.net/c/bugs-problems-issues/11).

mkdocs.yml

@@ -115,6 +115,7 @@ nav:
     - 'Pi-hole Origins': main/origins.md
     - 'On the Web': main/coverage.md
   - 'Getting Started':
+    - 'Getting Started': main/index.md
     - 'Prerequisites': main/prerequisites.md
     - 'Installation': main/basic-install.md
     - 'Post-Install': main/post-install.md