docs: update introduction (#519)

* docs: update docs introduction

* docs: fix link in faq

docs/README.md

@@ -2,3 +2,21 @@
 
 Welcome to the Overseerr Documentation.
 
+## Features
+
+- **Full Plex integration**. Login and manage user access with Plex.
+- **Syncs to your Plex library** to show what titles you already have.
+- **Integrates with Sonarr and Radarr**. With more services to come in the future.
+- **Easy to use request system** allowing users to request individual seasons or movies in a friendly, clean UI.
+- **Simple request management UI**. Don't dig through the app to approve recent requests.
+- **Mobile-friendly design**, for when you need to approve requests on the go.
+- Granular permission system.
+- Localization into other languages.
+
+## Motivation
+
+The primary motivation for starting this project was to have an incredibly performant and easy to use application. There is a heavy focus on the user experience for both the server owner and the users. We feel requesting should be **effortless for the user**. Find the media you want, click request, and branch off efficiently into other titles that interest you, all in one seamless flow. For the server owner, Overseerr takes all the hassle out of approving your users' requests.
+
+## We need your help!
+
+Overseerr is an ambitious project. We have already poured a lot of work into this, with more coming. We need your valuable feedback and help with finding bugs. Also, being that this is an open-source project, anyone is welcome to contribute. Contribution includes building features, patching bugs, or even translating the application. You can find the contribution guide on our GitHub.

docs/support/faq.md

@@ -86,11 +86,10 @@ Perform these steps to verify the media item has a guid Overseerr can match.
 
 ### Help! My request still shows "requested" even though it's in Plex!?!
 
-**A:** See "[Some media is missing from Overseerr that I know is in Plex!](https://docs.overseerr.dev/v/docs/support/faq#some-media-is-missing-from-overseerr-that-i-know-is-in-plex)" for troubleshooting steps.
+**A:** See "[Some media is missing from Overseerr that I know is in Plex!](./faq.md#some-media-is-missing-from-overseerr-that-i-know-is-in-plex)" for troubleshooting steps.
 
 ## Notifications
 
 ### I am getting "Username and Password not accepted" when sending email notifications to gmail!
 
 **A:** If you have 2-Step Verification enabled on your account you will need to create an app password. More details can be found [here](https://support.google.com/mail/answer/185833).
-