Wtc 171 fix avatar

[skibinska]

fixes #171

• remove unused svgs
• update checkmark.svg
• add new checkmark to avatar.hbs and finished.hbs
• add animation to checkmark
• fix displaying loader when send button was clicked with empty input

[codecov-io]

Codecov Report

Merging #175 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #175   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines           9      9           
  Branches        4      4           
=====================================
  Hits            9      9

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