Sphinx-ads

* Added the GitHub Action workflows to handle documentation build, extension release, and pull requests checks
* Updated the documentation
* Minor changes to extension code
* **13.02.2023** - Added the following changes:
* Wrote the documentation for Sphinx-Ads
* Wrote the JS and CSS code for the default carousel layout
* **11.02.2023** - Added JavaScript to move pre-generated HTML code to the needed HTML destination and made some minor changes.
* **05.02.2023** - Added function to check ads configuration variables
* **03.02.2023** - Added the Template class which contains the following methods:
* Method to provide the paths to the Jinja templates
* Method to retrieve Jinja templates
* Method to return advertisement HTML based on the layout
* **26.01.2023** - Added the :ref:`ads_path` and :ref:`ads_url` configuration options and the functions to load JSON data from path or URL
* **25.01.2023** - Setup Sphinx-Ads project and configure documentation

* **13.03.2023** - Updated release version to ``0.0.2``.
* **12.03.2023** - Updated documentation.

* Created the tag `0.0.1` for release.
* Added documentation about writing custom Jinja templates.
* Made some minor changes.
* **01.03.2023** - Added documentation about the JSON data
* **28.02.2023** - Added JSON schema validation support
* **27.02.2023** - Added both Python and JavaScript test cases for the extension and added the JavaScript test CI action
* **24.02.2023** - Bugfix: Fixed bug in Sphinx-Ads JavaScript code to run only when the HTML document has loaded

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