Update documentation with correct Git commands

The documentation has been updated to replace incorrect references of 'playbooks-repository' with the correct 'git' command. Additionally, an icon source in the main site page was replaced to better reflect the compatibility with Ansible. These changes ensure that users are provided with accurate instructions and consistent visual cues.

site/contribute/index.md

@@ -32,8 +32,7 @@ git checkout master
 # Pull the latest updates
 git pull
 
-# Create a new branch for your changes
-playbooks-repository checkout -b <YOUR-BRANCH-NAME>
+git checkout -b <YOUR-BRANCH-NAME>
 ```
 
 ## Making Changes
@@ -51,13 +50,13 @@ After your changes, commit and push them to your GitHub repository.
 
 ```sh
 # Add changes
-playbooks-repository add .
+git add .
 
 # Commit the changes
-playbooks-repository commit -m "<COMMIT-MESSAGE>"
+git commit -m "<COMMIT-MESSAGE>"
 
 # Push your changes to your repository
-playbooks-repository push origin <YOUR-BRANCH-NAME>
+git push origin <YOUR-BRANCH-NAME>
 ```
 
 ## Submitting a Pull Request