- Revised the README to improve clarity in instructions for accessing the calendar miniapp, including changes to the phrasing for consistency.
- Updated the configuration documentation to enhance the description of the `EXTERNAL_CALENDAR_ICS_URL` setting, ensuring users understand its purpose and usage.
- Improved the import format documentation by translating terms to English for better accessibility to a wider audience.
- Enhanced the runbook with clearer instructions regarding access issues when using direct links, emphasizing the importance of using the bot's menu button.
- Created a new `CHANGELOG.md` file to document all notable changes to the project, adhering to the Keep a Changelog format.
- Updated `CONTRIBUTING.md` to include instructions for building and previewing documentation using MkDocs.
- Added `mkdocs.yml` configuration for documentation generation, including navigation structure and theme settings.
- Enhanced various documentation files, including API reference, architecture overview, configuration reference, and runbook, to provide comprehensive guidance for users and developers.
- Included new sections in the README for changelog and documentation links, improving accessibility to project information.
