Repo card hide border

[Bas950]

As requseted in #480
Making different PRs for the new features

/api/pin/?username=USER&repo=REPO

/api/pin/?username=USER&repo=REPO&hide_border=true

(Hard to see... but it is removed.)

Will make PRs for the other features after this one is merged, otherwise we will get merge conflicts.

[codecov]

Codecov Report

Merging #488 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #488      +/-   ##
==========================================
+ Coverage   92.36%   92.37%   +0.01%     
==========================================
  Files          20       20              
  Lines         576      577       +1     
  Branches      159      160       +1     
==========================================
+ Hits          532      533       +1     
  Misses         38       38              
  Partials        6        6              

Impacted Files	Coverage Δ
api/index.js	94.11% <ø> (ø)
api/pin.js	91.30% <ø> (ø)
api/top-langs.js	94.11% <ø> (ø)
src/cards/wakatime-card.js	70.00% <ø> (ø)
src/common/retryer.js	72.22% <ø> (ø)
src/common/utils.js	97.36% <ø> (ø)
src/fetchers/repo-fetcher.js	95.83% <ø> (ø)
src/fetchers/top-languages-fetcher.js	100.00% <ø> (ø)
src/fetchers/wakatime-fetcher.js	100.00% <ø> (ø)
themes/index.js	100.00% <ø> (ø)
... and 3 more

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[anuraghazra]

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[anuraghazra]

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[anuraghazra]

Thanks @Bas950!