[Frontned] Filter sources in search results

[zzap]

Create filters for docs sources:

• WP Code reference
• WP-CLI
• PHP.NET
• ..

Something like this

[dhanukanuwan]

@zzap I'm going to start working on this.

[KevinBatdorf]

@dhanukanuwan you can build off the PR here: #21

But we may still need to add the backend route too cc: @heiglandreas

[heiglandreas]

The backend already supports that. See zzap/docs_dangit-the-beast#16 for more details

[dhanukanuwan]

We can still enable filtering for the retrieved results from the front end, right? But the filtering will be reset to default (all) after every new search. We already have sources coming from the backend.

Screenshot: https://prnt.sc/Z37NHQFDMPJX

[dhanukanuwan]

Noted @heiglandreas