Fix 1586 Docs: provide a index.md

* I renamed the introduction.md to index.md
* I moved over the FE parts to an index file in the FE repo (will do an MR in the FE repo to actually add it)
* While I was at it, I also fixed some broken links

diff --git a/docs/index.md b/docs/index.md
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+# Introduction to Pleroma
+## What is Pleroma?
+Pleroma is a federated social networking platform, compatible with Mastodon and other ActivityPub implementations. It is free software licensed under the AGPLv3.
+It actually consists of two components: a backend, named simply Pleroma, and a user-facing frontend, named Pleroma-FE. It also includes the Mastodon frontend, if that's your thing.
+It's part of what we call the fediverse, a federated network of instances which speak common protocols and can communicate with each other.
+One account on an instance is enough to talk to the entire fediverse!
+
+## How can I use it?
+
+Pleroma instances are already widely deployed, a list can be found at <https://the-federation.info/pleroma> and <https://fediverse.network/pleroma>.
+
+If you don't feel like joining an existing instance, but instead prefer to deploy your own instance, that's easy too!
+Installation instructions can be found in the installation section of these docs.
+
+## I got an account, now what?
+Great! Now you can explore the fediverse! Open the login page for your Pleroma instance (e.g. <https://pleroma.soykaf.com>) and login with your username and password. (If you don't have an account yet, click on Register)
+
+### Pleroma-FE
+The default front-end used by Pleroma is Pleroma-FE. You can find more information on what it is and how to use it in the [Introduction to Pleroma-FE](../frontend).
+
+### Mastodon interface
+If the Pleroma interface isn't your thing, or you're just trying something new but you want to keep using the familiar Mastodon interface, we got that too!
+Just add a "/web" after your instance url (e.g. <https://pleroma.soycaf.com/web>) and you'll end on the Mastodon web interface, but with a Pleroma backend! MAGIC!
+The Mastodon interface is from the Glitch-soc fork. For more information on the Mastodon interface you can check the [Mastodon](https://docs.joinmastodon.org/) and [Glitch-soc](https://glitch-soc.github.io/docs/) documentation.
+
+Remember, what you see is only the frontend part of Mastodon, the backend is still Pleroma.