Branding VIVO via UI

[chenejac]

Is your feature request related to a problem? Please describe.
Evaluators of VIVO could easily make VIVO looks similar as institutional web site.

Describe the solution you'd like
Two approaches should be supported:

• simple customization
  • log in as root administrator
  • open SiteAdmin-> Site Information
    • upload logo
    • define institutional colors (color picker should be supported)
      • primary color
      • secondary color
      • background color
      • footer background color
• advance customization
  • log in as root administrator
  • open SiteAdmin-> Site Information
  • download existing css of the theme
  • upload of custom css

After saving Site Information form, the changes should be applied