#108 Artist URLs should have a consistent normalized order (by domain)

General sorting order I've used: - **Listening Sites:** Bandcamp, SoundCloud, YouTube - **Art Sites:** Tumblr, DeviantArt - **Social Sites:** Twitter, Instagram - **Personal Sites:** Carrd, any personal artist domain, etc We should do a pass of all domains referenced in artist URLs and declare a specific sort, then *automatically* change the order in existing data files, and refer to the list manually when adding new URLs. I don't think these should be sorted *by* the wiki code, but we could definitely have an automated data check against the defined sorting order. This isn't required for the immediate upcoming release (YAML writing through the REPL (or at all) isn't a priority for release).