[docs] Revamp the installation guide (#1877)

This tries to revamp/restructure the installation guide. It's renamed to
"Getting Started" as it now contains a few more things than just the
installation, especially the deployment considerations which we didn't
use to spell out as much ahead of time.

Installation is now a section with the guides on their own. I've removed
a bit of redundancy like the user creation. I also removed the rogue
reverse proxy section in the Docker guide and lifted that into the
reverse proxy section.

docs/getting_started/releases.md

@@ -0,0 +1,40 @@
+# Releases
+
+GoToSocial can be installed in a number of different ways. We publish official binary releases as well as container images. A number of third-party packages are maintained by different distributions and some people have created additional deployment tooling to make it easy to deploy GoToSocial yourself.
+
+## Binary releases
+We publish binary builds for Linux to [our GitHub project](https://github.com/superseriousbusiness/gotosocial/releases):
+
+* 32-bit Intel/AMD (i386/x86)
+* 64-bit Intel/AMD (amd64/x86_64)
+* 32-bit ARM (v6 and v7)
+* 64-bit ARM64
+
+For FreeBSD we publish:
+
+* 64-bit Intel/AMD (amd64/x86_64)
+
+## Containers
+
+We also publish container images [on the Docker Hub](https://hub.docker.com/r/superseriousbusiness/gotosocial).
+
+Containers are released for the same Linux platforms as our binary releases, with the exception of 32-bit Intel/AMD.
+
+## Third-party
+
+Some folks have created distribution packages for GoToSocial or additional tooling to aid in installing GoToSocial.
+
+### Distribution packages
+
+These packages are not maintained by GoToSocial, so please direct questions and issues to the repository maintainers (and donate to them!).
+
+[![Packaging status](https://repology.org/badge/vertical-allrepos/gotosocial.svg)](https://repology.org/project/gotosocial/versions)
+
+### Deployment tools
+
+You can deploy your own instance of GoToSocial with the help of:
+
+- [YunoHost GoToSocial Packaging](https://github.com/YunoHost-Apps/gotosocial_ynh) by [OniriCorpe](https://github.com/OniriCorpe).
+- [Ansible Playbook (MASH)](https://github.com/mother-of-all-self-hosting/mash-playbook): The playbook supports a many services, including GoToSocial. [Documentation](https://github.com/mother-of-all-self-hosting/mash-playbook/blob/main/docs/services/gotosocial.md)
+- GoToSocial Helm Charts:
+  - [GoToSocial Helm Chart](https://github.com/fSocietySocial/charts/tree/main/charts/gotosocial) by [0hlov3](https://github.com/0hlov3).