Moved guides from readme to docs. Refactored docs

docs/guides/migration-guide.md

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+# Migration instructions (2.x to v3)
+
+## Windows
+
+1. Run your NadekoBot Updater first, and **make sure your bot is updated to at least 2.46.5**
+2. Get the new NadekoBot v3 Updater [here](https://dl.nadeko.bot/v3)
+3. Click on the + icon to add a new bot
+4. Next to the path, click on the folder icon and select the folder where your 2.46.5 bot is
+   - ℹ In case you're not sure where it's located, you can open your old updater and see it
+5. If you've selected the correct path, you should have an **Update** button available, click it
+6. You're done; you can now run your bot, and you can uninstall your old updater if you no longer have 2.x bots
+7. 🎉
+
+## Linux
+
+1. In order to migrate a bot hosted on **Linux**, first update your current version to the latest 2.x version using the 2.x installer, run the bot, and make sure it works. Then:
+   - Run the **old** installer with `cd ~ && wget -N https://github.com/Kwoth/NadekoBot-BashScript/raw/1.9/linuxAIO.sh && bash linuxAIO.sh`
+   - Run option **1** again
+   - Run the bot
+   - Type `.stats` and ensure the version is `2.46.5` or later
+   - Stop the bot
+2. Make sure your bot's folder is called `NadekoBot`
+   - Run `cd ~ && ls`
+   - Confirm there is a folder NadekoBot
+3. Migrate your bot's data using the new installer:
+   - Run the **new** installer `cd ~ && wget -N https://gitlab.com/Kwoth/nadeko-bash-installer/-/raw/master/linuxAIO.sh && bash linuxAIO.sh`
+   - The installer should notify you that your data is ready for migration in a message above the menu
+   - Install prerequisites (type `1` and press enter), and make sure it is successful
+   - Download NadekoBot v3 (type `2` and press enter)
+   - Run the bot (type `3` and press enter)
+4. Make sure your permissions, custom reactions, credentials, and other data is preserved
+   - `.stats` to ensure owner id (credentials) is correct
+   - `.lcr` to see custom reactions
+   - `.lp` to list permissions
+5. 🎉 Enjoy. If you want to learn how to update the bot, click (here)[#linux-updating-the-bot].
+
+## Manual 
+
+⚠ NOT RECOMMENDED  
+⚠ NadekoBot v3 requires [.net 5](https://dotnet.microsoft.com/download/dotnet/5.0)
+
+1. In order to migrate a bot hosted **on Linux or from source on Windows**, first update your current version to the latest 2.x version using the 2.x installer, run the bot, and make sure it works. Then:
+2. Rename your old nadeko bot folder to `nadekobot_2x`
+   - `mv NadekoBot nadekobot_2x`
+3. Build the new version and move old data to the output folder 
+   1. Clone the v3 branch to a separate folder 
+      - `git clone https://gitlab.com/kwoth/nadekobot -b v3 --depth 1`
+   2. Build the bot
+      - `dotnet publish -c Release -o output/ src/NadekoBot/`
+   3. Copy old data
+      - ⚠ Be sure you copy the correct command for your system!
+      - **Windows:** `cp -r -fo nadekobot_2x/src/NadekoBot/data nadekobot/src/NadekoBot/data`
+      - **Linux:** `cp -rf nadekobot_2x/src/NadekoBot/data nadekobot/src/NadekoBot/data`
+   4. Copy the database 
+      - `cp nadekobot_2x/src/NadekoBot/bin/Release/netcoreapp2.1/data/NadekoBot.db nadekobot/output/data`
+   5. Copy your credentials
+      - `cp nadekobot_2x/src/NadekoBot/credentials.json nadekobot/output/`
+4. Run the bot
+   - `cd nadekobot/output`
+   - `dotnet NadekoBot.dll`
+5. That's it. Just make sure that when you're updating the bot, you're properly backing up your old data.