Render block content

[KokkieH]

Fixes #9

• Added a block.json file
• Added separate stylesheets for styling block in editor and on front end
• Added color settings support to Settings sidebar
• Added Commit Hash input to Settings sidebar
• Added save function to display block content on front end
• Added API call to fetch commit data
• Render API data in the block and on the front end
• Added a custom GitHub icon to the block

Next steps:

• I don't like the same code for the block content being re-used in the edit and save functions. Is it possible to assign the output to a single attribute so we can then just re-use that one attribute?
• I figured out how to prevent the .editor-styles-wrapper from overriding my custom stylesheet for the block in the editor, but it seems the block colour controls don't have any effect on text added inside the <h3> or <a> elements.
• I need to figure out how to use the Notice component to display an error notice in the editor if the API call fails due to an invalid commit hash.

But it works, so this is ready to ship.

[tgglv]

Thanks, @KokkieH!

The changes look great. The only thing I want to highlight is that we should remove built sources from repo by adding build folder into a .gitignore. Otherwise, everything is great!

[KokkieH]

we should remove built sources from repo by adding build folder into a .gitignore

Thanks for the tip. I think 1db80d6 should do it.