fix(back): add route to expose favicon from rice bundle

[jsdidierlaurent]

No description provided.

[codecov]

Codecov Report

Merging #147 into master will increase coverage by 0.52%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage    98.2%   98.72%   +0.52%     
==========================================
  Files          57       57              
  Lines        1723     1726       +3     
==========================================
+ Hits         1692     1704      +12     
+ Misses         31       22       -9

Flag	Coverage Δ
#core	98.72% <100%> (+0.52%)	⬆️

Impacted Files	Coverage Δ
service/server.go	95.52% <100%> (+14.27%)	⬆️

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