Move CSS variables definition from vector.less to arch_definitions.less

Jakub Klinkovskýrequested to merge
lahwaacz/archwiki:fix-css-vars into master

This is a hotfix for !90 (comment 254665) but we should also consider these points in the future:

  • Do we actually need the LESS variables or would it be fine to switch everything to pure CSS?
  • We should probably add some prefix like arch- to all our CSS variables.

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