Wtc 162 add start again button

[skibinska]

fixes #162

• when the send button is clicked the form is replaced with start again button, which redirects to home page
• update finished.hbs and route for this page

[codecov-io]

Codecov Report

Merging #164 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #164   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines           9      9           
  Branches        4      4           
=====================================
  Hits            9      9

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