Several updates to automation workflow

- Update `generate-readme.yml` to use Python scripts. Previously it was
  awk scripts.
- Rename python script to `generate_readme`. Previously it was called
  `main.py`.
- Add note to `CONTRIBUTING.md` explaining the new file to add
  manual entries.
- Fix typo in `CONTRIBUTING.md`.

.github/workflows/generate-readme.yml

@@ -16,14 +16,9 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Set up dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y gawk
-
       - name: Generate README.md
         run: |
-          awk -f scripts/awk/addGithubShields.awk _README.md | awk -f scripts/awk/makeShieldsSquare.awk > README.md
+          python3 generate_readme.py _README.md > README.md
 
 
       - name: Commit changes

CONTRIBUTING.md

@@ -4,11 +4,11 @@ Please note that this project is released with a [Contributor Code of Conduct](c
 
 Ensure your pull request adheres to the following guidelines:
 
-- Edit and modify the `README.md` file.
+- Edit and modify the `_README.md` file. `README.md` is automatically generated from this file.
 - Ensure that the project you submit does not duplicate existing entries.
 - Ensuring that the items you submit have at least working documentation for the description.
 - Ensure that you add new item in alphabetical order
-- Ensure that the new item have correct category. suggest new one if you find suitable
+- Ensure that the new item have correct category. Suggest new one if you find suitable
 - Submit a separate PR for each item.
 - Format the PR title as `Add item: item name`/`Fix item: item name`.