Add sleeping page. Related #4

[RhodesPeter]

• Added sleep.hbs
• Added _sleep.scss
• Added correct route from this page:
  • Forward to finished.hbs
  • Backwards to personality.hbs
• Added our first sprite! (lion-sleeping-sprite.svg)
• Added range-buttons.svg

[codecov-io]

Codecov Report

Merging #95 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #95   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          30     32    +2     
  Branches        2      2           
=====================================
+ Hits           30     32    +2

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

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