feat: move main readme over

docs/images/main/index.md

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+# Main
+
+[![build-ublue](https://github.com/ublue-os/main/actions/workflows/build.yml/badge.svg)](https://github.com/ublue-os/main/actions/workflows/build.yml)
+
+A common main image for all other uBlue images, with minimal (but important) adjustments to Fedora. <3  
+
+1. [Features](#Features)
+1. [Tips and Tricks](#Tips-and-Tricks)
+1. [How to Install](#How-to-Install)
+1. [Verification](#Verification)
+1. [Configuring Automatic Updates](#Configuring-Automatic-Updates)
+1. [Making your own](#Making-your-own)
+
+## What is this?
+
+You should be familiar with [image-based desktops](https://silverblue.fedoraproject.org/about). These are Fedora OStree images that have been modified with the following quality of life features:
+
+## Features
+
+- Start with a Fedora image
+- Adds the following packages to the base image:
+  - Hardware acceleration and codecs
+  - `distrobox` for terminal CLI and user package installation
+  - A selection of [udev rules and service units](https://github.com/ublue-os/config)
+  - [libratbag](https://github.com/libratbag/libratbag), to configure supported mice via [piper](https://github.com/libratbag/piper)
+  - Several pre-built [drivers/akmods](https://github.com/ublue-os/akmods)
+  - Various other tools: check out the [complete list of packages](https://github.com/ublue-os/main/blob/main/packages.json)
+- Sets automatic staging of updates for the system
+- Sets flatpaks to update twice a day
+- Everything else (desktop, artwork, etc) remains stock so you can use this as a good starting image
+
+## Tips and Tricks
+
+Unlike traditional Linux distributions, the base image is intended to be used "out of the box" as it is, packages are installed via Flatpak whenever possible (execpt for IDEs in some cases, more below).
+Should that not be possible, you can use [distrobox](https://github.com/89luca89/distrobox) to have images of mutable distributions where you can install applications normally.
+Want an application that is only available on Arch Linux *and* one that is only on Ubuntu? Well, now can have both!
+
+Distrobox is very powerful, for example you can use to [host your entire development environment](https://github.com/89luca89/distrobox/blob/main/docs/posts/integrate_vscode_distrobox.md) completely separate from your host system. Or use it to run a [container for your virtual machines](https://github.com/89luca89/distrobox/blob/main/docs/posts/run_libvirt_in_distrobox.md).
+
+ublue-os/base-main is also very well suited for servers, and users are expected to make full use of `podman` to host containers running "typical" server software i.e. `nginx`, `caddy` and others. 
+
+## How to Install
+
+[Follow these instructions](/installation)
+1. [File an issue](https://github.com/ublue-os/main/issues) if you find a problem
+
+## Verification
+
+These images are signed with sigstore's [cosign](https://docs.sigstore.dev/cosign/overview/). You can verify the signature by downloading the `cosign.pub` key from this repo and running the following command:
+
+    cosign verify --key cosign.pub ghcr.io/ublue-os/silverblue-main
+
+If you're forking this repo you should [read the docs](https://docs.github.com/en/actions/security-guides/encrypted-secrets) on keeping secrets in github. You need to [generate a new keypair](https://docs.sigstore.dev/cosign/overview/) with cosign. The public key can be in your public repo (your users need it to check the signatures), and you can paste the private key in Settings -> Secrets -> Actions.
+
+## [![Repography logo](https://images.repography.com/logo.svg)](https://repography.com) / Recent activity [![Time period](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_badge.svg)](https://repography.com)
+[![Timeline graph](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_timeline.svg)](https://github.com/ublue-os/main/commits)
+[![Issue status graph](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_issues.svg)](https://github.com/ublue-os/main/issues)
+[![Pull request status graph](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_prs.svg)](https://github.com/ublue-os/main/pulls)
+[![Trending topics](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_words.svg)](https://github.com/ublue-os/main/commits)
+[![Top contributors](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_users.svg)](https://github.com/ublue-os/main/graphs/contributors)
+[![Activity map](https://images.repography.com/35181738/ublue-os/main/recent-activity/xrA_PaNuNMQaiMXAgCjt1WHFLAbONeWxJABDiQSIMJI/sadhuTBbL8fbqM2jXKHWg-T1EsqHwZ2NlnlT6FB-e7Q_map.svg)](https://github.com/ublue-os/main/commits)