Wtc 88 add buttons

[skibinska]

Fixes #88

• Add buttons partial
• Add partial to all hbs files
• Add data to routes
• Add basic styles for buttons on each page
• Add two more tests for route
• Clean up scss files

[codecov-io]

Codecov Report

Merging #91 into master will increase coverage by 9.09%. The diff coverage is 100%.

@@           Coverage Diff            @@
##           master    #91      +/-   ##
========================================
+ Coverage    90.9%   100%   +9.09%     
========================================
  Files           2      2              
  Lines          22     28       +6     
  Branches        2      2              
========================================
+ Hits           20     28       +8     
+ Misses          2      0       -2

Impacted Files	Coverage Δ
src/server.js	100% <ø> (ø)	:white_check_mark:
src/routes.js	100% <100%> (+22.22%)	:white_check_mark:

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