Challenge: Download art based on keywords

[DonaldTsang]

Like #2 but with a few key differences:

1. The links will be different
   • Keywords will be https://www.deviantart.com/popular-all-time/?q=<keyword>
2. Metadata should be the same
3. User recommendation should be the same, but now "keyword recommendation" should also exist
   • NLP toolkits will need to be considered
   • Of course common words should be excluded
4. Artist depth should be the same, but not "keyword depth" should also exist
   • Keyword depth should be weighted differently than Artist depth