Fix/lint

[traumschule]

CI checks shared these 11 on dev

@joystream/pioneer
 | 
 | /home/runner/work/pioneer/pioneer/packages/ui/src/council/hooks/useCouncilRemainingPeriod.ts
 |   2:30  warning  'concatMap' is defined but never used   @typescript-eslint/no-unused-vars
 |   2:41  warning  'EMPTY' is defined but never used       @typescript-eslint/no-unused-vars
 |   2:48  warning  'merge' is defined but never used       @typescript-eslint/no-unused-vars
 |   2:[5](https://github.com/Joystream/pioneer/actions/runs/3718045132/jobs/6305953870#step:5:6)5  warning  'Observable' is defined but never used  @typescript-eslint/no-unused-vars
 |   2:67  warning  'of' is defined but never used          @typescript-eslint/no-unused-vars
 | 
 | /home/runner/work/pioneer/pioneer/packages/ui/src/forum/components/ForumPageHeader.tsx
 |   [6](https://github.com/Joystream/pioneer/actions/runs/3718045132/jobs/6305953870#step:5:7):10  warning  'TextMedium' is defined but never used  @typescript-eslint/no-unused-vars
 | 
 | /home/runner/work/pioneer/pioneer/packages/ui/src/forum/components/category/LatestPost.tsx
 |    5:10  warning  'Loading' is defined but never used             @typescript-eslint/no-unused-vars
 |   1[7](https://github.com/Joystream/pioneer/actions/runs/3718045132/jobs/6305953870#step:5:8):25  warning  'isLoading' is assigned a value but never used  @typescript-eslint/no-unused-vars
 | 
 | /home/runner/work/pioneer/pioneer/packages/ui/src/forum/components/category/PopularThread.tsx
 |    5:[10](https://github.com/Joystream/pioneer/actions/runs/3718045132/jobs/6305953870#step:5:11)  warning  'Loading' is defined but never used             @typescript-eslint/no-unused-vars
 |   17:[11](https://github.com/Joystream/pioneer/actions/runs/3718045132/jobs/6305953870#step:5:12)  warning  'isLoading' is assigned a value but never used  @typescript-eslint/no-unused-vars
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 | /home/runner/work/pioneer/pioneer/packages/ui/src/memberships/components/MemberProfile/MemberRoleToggle.tsx
 |   35:21  warning  'currentDayEarnings' is assigned a value but never used  @typescript-eslint/no-unused-vars
 | 
 | ✖ 11 problems (0 errors, 11 warnings)

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Name	Status	Preview	Updated
dao	✅ Ready (Inspect)	Visit Preview	Dec 17, 2022 at 7:59AM (UTC)
pioneer-2	✅ Ready (Inspect)	Visit Preview	Dec 17, 2022 at 7:59AM (UTC)
pioneer-2-storybook	✅ Ready (Inspect)	Visit Preview	Dec 17, 2022 at 7:59AM (UTC)