[Proposed Feature] Keyboard shortcuts

[jedsundwall]

Description of Feature:

Allow data users to navigate Source using keyboard shortcuts.

Windows	macOS	Function
k	k	Select previous repository when browsing list of repositories, select previous object when browsing content within a repository.
j	j	Select next repository when browsing list of repositories, select next object when browsing content within a repository.
Enter or o	Enter or o	If a repository is selected, open repository. If a folder within a repository is selected, open folder.
c + u	c + u	Copy URL of selected repository if repository is selected. Copy URL of selected folder or object when browsing content within a repository.
~	~	Go to previous section when browsing a repository. Go to list of repositories if at the root of a repository.
g + r	g + r	Go to readme tab when browsing a repository.
g + b	g + b	Go to browse tab when browsing a repository.
g + l	g + l	Go to list of repositories.
Shift + Esc	Shift + Esc	Focus main window rather than any repository, folder, or object.

What value is this feature adding to Source Cooperative?

This will allow users to quickly navigate content published within Source and copy URLs that they can paste into other applications.