Fix github accessibility bugs and add an accordion component #9978
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Fixes microsoft/pxt-microbit#5498
Fixes microsoft/pxt-microbit#5503
Fixes microsoft/pxt-microbit#5500
This PR contains two small accessibility fixes for the github integration and one larger one that also adds a new react-common accordion component.
The "History" portion of the GitHub integration is where the accordion is used. This overhauls that section with react-common components and fixes microsoft/pxt-microbit#5500 in the process. The UI is basically unchanged.