Support searching by tags?

[ericholscher]

We should decide if we want to support searching & filtering by tags. The old version of the code had some basic support for this, but it isn't currently enabled.

We should decide the use cases that we want to support here. Some users are using tags, but we don't have a ton of tag data, and it's kind of hidden in the UI.

If we decide we want to support it, we should add tests to make sure it works.

Pros

• Users can filter by tags like django to see Django related projects
• Will highlight tagging more and make users more likely to use it

Cons

• A lot of projects aren't tagged, meaning users will miss useful things.
• Our Tag UI is pretty hidden, if we want to make this more useful, we should make the Tag UI better

I'm thinking we should support tags, as it will be a better outcome in the end if we get better tagging and let folks use it in search.

This refs #3698.

[humitos]

Our Tag UI is pretty hidden, if we want to make this more useful, we should make the Tag UI better

This is being discussed at #3476