Sync INSTALL.md with Emerald

docs/bugs_and_glitches.md

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+
+# Bugs and Glitches
+
+These are known bugs and glitches in the original Pokémon FireRed game: code that clearly does not work as intended, or that only works in limited circumstances but has the possibility to fail or crash. Defining the `BUGFIX` and `UBFIX` preprocessor variables will fix some of these automatically. `UBFIX` will already be defined for MODERN builds.
+
+Fixes are written in the `diff` format. If you've used Git before, this should look familiar:
+
+```diff
+ this is some code
+-delete red - lines
++add green + lines
+```
+
+## Contents
+
+<!--- TODO: Migrate from the wiki --->
+- [Bug 1](#bug-1)
+
+
+## Bug 1
+
+A brief description of the bug and how to reproduce it in the vanilla game
+
+**Fix:**
+
+Code to edit, in which routines, or data to edit, using the above mentioned diff syntax.

docs/legacy_WSL1_INSTALL.md

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+### Setting up WSL1 (Legacy Portion)
+
+1. Certain packages are required to build pokeemerald. Install these packages by running the following command:
+
+    ```bash
+    sudo apt install build-essential git libpng-dev gdebi-core
+    ```
+    > Note: If the above command does not work, try the above command but replacing `apt` with `apt-get`.
+
+2. Once the packages have finished installing, download the devkitPro pacman package [here](https://github.com/devkitPro/pacman/releases). The file to download is `devkitpro-pacman.amd64.deb`.
+
+3. WSL has its own file system that's not accessible from Windows, but Windows files *are* accessible from WSL. To install the devkitPro package, you'll need to change to the **current working directory** where the package file was saved.
+
+    For example, if the package file was saved to **C:\Users\\_\<user>_\Downloads** (the Downloads location for most users), enter this command, where *\<user>* is your **Windows** username:
+
+    ```bash
+    cd /mnt/c/Users/<user>/Downloads
+    ```
+
+    > Note 1: The Windows C:\ drive is called /mnt/c/ in WSL.  
+    > Note 2: If the path has spaces, then the path must be wrapped with quotations, e.g. `cd     "/mnt/c/users/<user>/Downloads folder"`.  
+    > Note 3: Windows path names are case-insensitive so adhering to capitalization isn't needed
+
+4. Once the directory has been changed to the folder containing the devkitPro pacman package, run the following commands to install devkitARM.
+
+    ```bash
+    sudo gdebi devkitpro-pacman.amd64.deb
+    sudo dkp-pacman -Sy
+    sudo dkp-pacman -S gba-dev
+    ```
+
+    The last command will ask for the selection of packages to install. Just press Enter to install all of them, followed by entering Y to proceed with the installation.
+
+    > Note: `devkitpro-pacman.amd64.deb` is the expected filename of the devkitPro package downloaded (for the first command). If the downloaded package filename differs, then use that filename instead.
+
+5. Run the following command to set devkitPro related environment variables (alternatively, close and re-open WSL):
+    ```bash
+    source /etc/profile.d/devkit-env.sh
+    ```
+
+Proceed to [Choosing where to store pokeemerald (WSL1) of the current INSTALL.md](/INSTALL.md#choosing-where-to-store-pokeemerald-WSL1).