Slow-start-rewatch

- Fix configuration of links to ensure compatibility with Reddit Mobile App
- Increase delay before updating the post with the thumbnail

- Fix bug caused by an unsupported character in the config on Windows with Japanese encoding

- Update dependencies and setup.cfg
- Add navigation links to the previous and the next post
- Increase delays before updating posts
- Ignore post update errors (to proceed with other tasks)
- Increase verbosity

- Update dependencies and setup.cfg

- Update the link to the Status image in the README file
- Update dependencies
- Extend the `Config` to allow storing more items locally (using YAML)
- Initialize the `Config` inside the `App` class to handle errors during the `Config` loading
- Add `Schedule`, `ScheduleStorage` and `ScheduleFileStorage` classes for storing scheduled posts
- Change the post scheduling to the UTC time
- Implement the post scheduling based on the data provided by the `Schedule` class
- Add the `ScheduleWikiStorage` class for storing scheduled posts on Reddit's wiki

- Update dependencies
- Replace `dotty-dict` with `scalpl` to avoid compatibility issues on Windows 10 with Japanese locale
- Use a random port number for testing the HTTP server (to ensure the port is available)