[#52] Improve layout

[march93]

• Moved DisplayReposList into a separate page
• Added new router for repos page
• Updated repos page styling

Issue #52

[codecov-io]

Codecov Report

Merging #54 into master will decrease coverage by 14.34%.
The diff coverage is 60.00%.

@@             Coverage Diff             @@
##           master      #54       +/-   ##
===========================================
- Coverage   66.24%   51.89%   -14.35%     
===========================================
  Files          10       10               
  Lines         157      158        +1     
  Branches       34       34               
===========================================
- Hits          104       82       -22     
- Misses         50       72       +22     
- Partials        3        4        +1     

Impacted Files	Coverage Δ
src/RepoCard.js	25.00% <ø> (ø)
src/Main.js	68.08% <60.00%> (-1.49%)	⬇️
src/DisplayReposList.js	0.00% <0.00%> (-53.66%)	⬇️

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