Projects page: Allow multiple filters to be “active” at one time(eg ‘tech’, ‘stages’, ‘events’, ‘topics’). Show those filters on the screen to the user.

The projects page currently can only be viewed by one tag, stage, etc at a time. A member may, though, be looking for a combination of tags, or may be interested in more than one stage.

For example: "I want to find javascript projects that are not drifting or hibernating."

Start at the projects page and trace how the current single filter is selected and rendered. Review the existing filter controls and project results behavior, then define combined filtering and visible active-filter state; done means multiple categories can be selected together and the chosen filters are shown on screen.

Written by the indexing model from the issue text.