docs: Remove unneeded steps to build from source

Author: oSumAtrIX

docs/4_building.md

@@ -9,23 +9,13 @@ This page will guide you through building ReVanced Manager from source.
    ```sh
    git clone https://github.com/revanced/revanced-manager.git && cd revanced-manager
    ```
-
-3. Create a GitHub personal access token with the `read:packages` scope [here](https://github.com/settings/tokens/new?scopes=read:packages&description=ReVanced)
-
-4. Add your GitHub username and the token to `./android/gradle.properties`
-
-   ```properties
-   gpr.user = YourUsername
-   gpr.key = ghp_longrandomkey
-   ```
-
-5. Get dependencies
+3. Get dependencies
 
    ```sh
    flutter pub get
    ```
 
-6. Delete conflicting outputs
+4. Delete conflicting outputs
 
    ```sh
    flutter packages pub run build_runner build --delete-conflicting-outputs
@@ -34,7 +24,7 @@ This page will guide you through building ReVanced Manager from source.
    > [!Note]
    > Must be run every time you sync your local repository with the remote repository.
 
-7. Build the APK
+5. Build the APK
 
    ```sh
    flutter build apk