feat(themes): improve fleetish (#4813)

Small adjustements to the fleetish theme to improve readability
in certain cases. Specifically:

- use darker background for menues as it (purely subjectively) loooks
  better
- use different color for `constant.buildin.boolean` and
  `keyword` to make statements such as `return true` read better
- use different colors for different markup link parts
- destructure the config where appliable

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