Added guide to running documentation website locally (#5059)

* Added guide to running documentation website locally

* Added link to mdBook's official documentation.

---------

Co-authored-by: psf <[email protected]>

docs/SUMMARY.md

@@ -3,6 +3,8 @@
 - [README](./README.md)
 - [Installation](./INSTALL.md)
     - [Setting up WSL1 (Legacy Portion)](./legacy_WSL1_INSTALL.md)
+- [Run documentation site locally](local_mdbook/index.md)
+    - [Ubuntu WSL1/WSL2](local_mdbook/ubuntu_WSL.md)
 - [AI Flags](./ai_flags.md)
 - [Tutorials]()
   - [How to add new AI Flags](./ai_logic.md)

docs/local_mdbook/index.md

@@ -0,0 +1,2 @@
+## Running documentation website locally
+- [Ubuntu WSL1/WSL2](/docs/local_mdbook/ubuntu_WSL.md)

docs/local_mdbook/ubuntu_WSL.md

@@ -0,0 +1,51 @@
+Note: For further information beyond this very basic guide, please visit mdBook's [official documentation](https://rust-lang.github.io/mdBook/).
+
+## Running documentation website locally (Ubuntu WSL1/WSL2)
+### Previous Requirements:
+- Option 1: Install via Rust toolchain
+    - Install Rust toolchain if you don't have it via the `sudo apt install cargo` command.
+    - Install mdBook via the `cargo install mdbook` command. Once finished, this message will pop up, with {USER} being your Ubuntu
+        ```
+        warning: be sure to add `/home/{USER}/.cargo/bin` to your PATH to be able to run the installed binaries
+        ```
+    - Add `/home/{USER}/.cargo/bin` to your PATH (with {USER} being the Ubuntu username.)
+        - Run command `nano ~/.profile` to edit the file.
+        - Add the following lines, ***replacing {USER} with your Linux username.***
+            ```diff
+            # set PATH so it includes user's private bin if it exists
+            if [ -d "$HOME/bin" ] ; then
+                PATH="$HOME/bin:$PATH"
+            fi
+
+            # set PATH so it includes user's private bin if it exists
+            if [ -d "$HOME/.local/bin" ] ; then
+                PATH="$HOME/.local/bin:$PATH"
+            fi
+
+            +# set PATH so it includes cargo bin if it exists
+            +if [ -d "/home/{USER}/.cargo/bin" ] ; then
+            +    PATH="/home/{USER}/.cargo/bin:$PATH"
+            +fi
+            ```
+        - Run the `source ~/.profile` command to refresh the path in the current session.
+- Option 2: Install downloaded binaries directly
+    - TODO: Add documentation of this process.
+
+### Running the website
+- Navigate to the `docs` folder on the repository.
+- Run `mdbook serve`. Once started, you may now open the website on your browser by going to `http://127.0.0.1:3000`.
+- Every change done to the `docs` folder will be reflected with an automatic refresh.
+- To stop the server and go back to the terminal, press `Ctrl + C`.
+
+### Modifying the website
+- The navigation menu on the left is handled by `docs/SUMMARY.md`. Every file added needs to be added somewhere here in order to become visible, otherwise you'll get a 404 error.
+- Any Markdown files (.md extension) added to the `docs/` directory will automatically be read by mdBook.
+- To add Markdown files that are not in the `docs/` directory, you may create an empty `.md` file and add the following ***without the "----"***:
+    ```md
+    {{ ----#include ../INSTALL.md}}`
+    ```
+    This will include the `INSTALL.md` Markdown file from the root directory.
+
+Once you're set up, you can now check your changes before pushing them to your repo! :D
+
+We hope that this will make it easier for users to contribute to the documentation :)