Err-backend-discord

Added
- Added upgrade notes section to installation documentation.
- Added intents management.

Changed
- Fixed copy/paste error in documentation.
- Use the v2.0.1 discord python module.

Removed
- Support for python3.7 has been removed to allow the use of the v2.0.1 discord python module.

Changed
- Version bump for pypi release.

Added

Changed
- Restructured code base to support packaging for pypi.
- Migrated README documentation to readthedocs format.

Removed

Added
- Support `channelguild_id` representation.

Changed
- Use discord client 1.7.3
- Updated file_upload to support discord client v1.7.3.

Changed
- Use discord client 1.6.0
- Discord client uses Member intents.

Changed
- Use discord client 1.2.5