Hijridate

- 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.

- Fixed calculation of month 12 of the year 1354 AH.
- Fixed an issue when generating documentation without the package being installed. ([7](https://github.com/dralshehri/hijridate/issues/7))
- Refactored internal helper functions.
- Updated and improved tests and documentation.
- Fixed some typos.

- Added `today()` classmethod to Hijri class to get the Hijri Object of today's date.
- Added `separator` and `padding` parameters to `dmyformat()` method to have more control over formatting.
- Refactored locales for better management and testing. (Inspired by [Arrow](https://github.com/arrow-py/arrow) localization)
- Updated main classes to be conveniently imported into the package level e.g. `from hijri_converter import Hijri, Gregorian`.
- Removed deprecated method `slashformat()` from Hijri and Gregorian classes.
- Updated tests and documentation.
- Other minor fixes and internal enhancements.

- Minor fixes and enhancements for docstrings and documentation.

- Added Bangla translation. (By [nokibsarkar](https://github.com/nokibsarkar) in [#4](https://github.com/dralshehri/hijridate/pull/4))
- Changed `Hijri` rich comparison to return `NotImplemented` when the second operand is not `Hijri` class.
- Changed `ummalqura` constants to be in capital letters adhering to PEP8.
- Updated packaging configuration files and local development workflow.
- Other minor fixes and documentation enhancements.

- Added `dmyformat()` to return dates in `DD/MM/YYYY` format.
- Deprecated `slashformat()` method to be replaced by `dmyformat()` method.
- Fixed PyPI package not including some required files. ([3](https://github.com/dralshehri/hijridate/issues/3))
- Fixed some typos.
- Updated tests.