Get rid of tabindex

[atjn]

Tabindexes change the expected flow of the page to make it less intuitive, we should get rid of them.

Partially ununfixes #494

[krestenlaust]

I partly disagree. Every other page than the frontpage should have tabindexes removed.

But I think the frontpage should be in this order: Quickbuy -> buy -> restart -> menu -> tilmeld. I feel like it's more intuitive for them to be in that order🤔 Even though it isn't standard web. My main argument for us to ignore the web in this sense, is the way it's accessed (through the stregkiosk) it doesn't feel like a webpage, it's closer to a kind of game.

[atjn]

I feel like it's more intuitive for them to be in that order🤔

The first time I used the stregsystem, I wanted to access the menu, so I pressed Shift + Tab because that moves you back up towards the header in almost all apps, but the stregsystem did something else which confused me, so now I just always use the mouse.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.80%. Comparing base (a02bfdb) to head (104d49e).
Report is 3 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #540   +/-   ##
=======================================
  Coverage   80.80%   80.80%           
=======================================
  Files          40       40           
  Lines        3809     3809           
  Branches      481      481           
=======================================
  Hits         3078     3078           
  Misses        675      675           
  Partials       56       56           

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