Moved news to json API

This release includes no new features but the main change is news fetching is now done using the json-based RSS feed provided by the Godot Website team. This means we no longer need to scrape html, so fetching news will be much faster and reliable.
Thanks to @jokoho48 for the implementation

@Snirpsi also fixed a couple of bugs (see What's Changed for details)

Finally, I made tow little modifications. config.json is now pretty printed for easier debugging and manual modification. Also, I didn't like the copyright not acknowledging other people's efforts so now "and Contributors" was added to the copyright notice. You can click on it to see the full list on github.

What's Changed

• Fix bug where you can't save after editing godot versions. by @Snirpsi in #37
• fix bug where Save button is always available by @Snirpsi in #38
• Move News to Json Endpoint by @jokoho48 in #41

New Contributors

• @Snirpsi made their first contribution in #37

Full Changelog: v1.15...v1.15.1