Search result elements should be keyboard focusable

[jakeisnt]

Currently, none of the search results can be navigated or selected with keyboard input alone, because they lack the HTML tags that tell the browser how to select them.

Adding the HTML attributes tabindex and role (button) to the heading of each search result would allow these headings to be expanded and contracted without the use of a mouse, which will enable more users to make better use of the site.

[samueldr]

In a more natural manner, using <a> (or <button>) element as part of one of the cells, like attribute name, should fix this without requiring tabindex (which can cause problems) or role.

Since they are elements that can be focused using the keyboard naturally in the browser, the browser already knows how to handle them. It is how it was handled before the move to the new Elm app. (I don't have it running anywhere anymore to show that it worked.)

(I changed the title to a more actionable goal)