[FEATURE] Widget Support

[Lissy93]

Category: Feature

Overview
This is a big one...
Many users have requested the option to display dynamic content within their dashboard. This PR introduces this feature, in the form of widgets.

It includes:

• Several structural changes and improved code re-use, to allow for widget development
• 30+ pre-built widgets, to display info from public APIs, and some self-hosted services
• Custom widgets, to support (nearly) any service using embedded content, iframes or API responses
• A CORS proxy endpoint, to support apps that cannot make client-side network requests
• Docs, schema updates, tests and refactoring

Issue Number #229 #198 #231 #360 #370 #383

New Vars
A new item, under section has been added. section.widgets accepts an array or widgets.

Screenshot
See here for screenshots and alpha widget docs

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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Things to Note:

• Widgets are still in Alpha, there's a bit more work to do before they'll be stable
• It's not yet possible to manage (add or edit) widgets directly through the UI. This will come later
• Support for additional self-hosted services will come soon
• This PR should (hopefully) be merged within the next week

[Lissy93]

Yay, ready for merge!!

[liss-bot]

The fix for this issue has now been released in Dashy 2.0.0 ✨

If you haven't done so already, please update your instance to 2.0.0 or later. See Dashy 2.0.0 for full info.

Feel free to reach out if you need any more support. If you are enjoying Dashy, consider supporting the project.