Remove redundant static files, add useful links

[VMelnalksnis]

Changes proposed in this pull request:

• Remove empty site.js file
• Display version in web page
• Add links to GitHub/for opening the desktop app

[codecov]

Codecov Report

Merging #545 (5af4207) into master (55eb456) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@           Coverage Diff           @@
##           master     #545   +/-   ##
=======================================
  Coverage   67.96%   67.96%           
=======================================
  Files         301      302    +1     
  Lines        8986     8991    +5     
  Branches      654      655    +1     
=======================================
+ Hits         6107     6111    +4     
  Misses       2637     2637           
- Partials      242      243    +1     

Impacted Files	Coverage Δ
source/Gnomeshade.WebApi/Views/Home/Index.cshtml	100.00% <ø> (ø)
...shade.WebApi/Services/ApplicationVersionService.cs	75.00% <75.00%> (ø)
...ebApi/Areas/Identity/Pages/Account/Register.cshtml	65.21% <100.00%> (ø)
source/Gnomeshade.WebApi/Startup.cs	97.56% <100.00%> (+0.03%)	⬆️
...urce/Gnomeshade.WebApi/Views/Shared/_Layout.cshtml	80.00% <100.00%> (ø)

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