Show tabs in Releases page

[Torniojaws]

The Tabs endpoint has been implemented in the backend and is available via:

GET /api/1.0/songs/:id/tabs

With a response like:

{
  "songTitle": "Some song",
  "tabs": [
    {"title": "Guitar Pro 5", "filename": "somefile.gp5"},
    {"title": "Text", "filename": "somefile.txt"}
  ]
}

• [x] The tab files must be added to static/tabs/filename.ext first
• [x] Then the references must be added to the DB
• [x] Then provide links in the Releases page, next to the song names, eg. Song (1:23) - Guitar Pro 5 | Text

[Torniojaws]

All ready. When the next build is updated in PRD, the tabs will be visible.