Hijridate

- Fixed some typos.

- Dropped support for Python 3.7 and added support for Python 3.12.
- Fixed a typo in the Bangla translation. (By [nokibsarkar] in [18])
- Changed documentation theme along with other enhancements.

[18]: https://github.com/dralshehri/hijridate/pull/18
[nokibsarkar]: https://github.com/nokibsarkar

**IMPORTANT**

The `hijri-converter` package has been **renamed** to `hijridate` in preparation
for the upcoming major update.

Please use a version specifier e.g. `hijridate~=2.3.0` to avoid any breaking
changes in the future.

What's Changed

- Renamed the package to `hijridate` and deprecated the old name.
- Dropped support for Python 3.6 and added support for Python 3.11.
- Updated documentation and removed badges from the package description.
- Updated development configurations and GitHub actions.
- Changed GitHub username back to dralshehri and updated related links.

- Added more classifiers to package configuration.
- Fixed location of type-checking marker file. (By [dimbleby] in [10])
- Updated development and build requirements.

[10]: https://github.com/dralshehri/hijridate/pull/10
[dimbleby]: https://github.com/dimbleby

- Changed package docstrings to Google style and updated documentation.
- Updated development workflows and configurations.
- Other minor fixes and enhancements.
- Changed GitHub username to mhalshehri and updated related links.

- Added some missing variable annotations to `ummalqura` module.
- Fixed an issue when generating documentation.
- Fixed some typos in docstrings and improved documentation.
- Other minor fixes and enhancements.