Apply settings following Anne's experiments with `bs_themer()`

[AnneSchoenauer]

Hi @maurolepore, please add the following to the code that you need to implement this in our webtoo. I played around with the bs_themer() and the following I would suggest.

Colours:

• [x] Background colour: #E2E5E9
• [x] Foreground colour: #000000
• [x] Primary color: #287155
• [x] Secondary colour: #B3D15D
• [x] Success: #B3D15D
• [x] Info: #5170CF
• [x] Warning: #F6CB4E
• [x] Danger: #E3693B

Fonts (google fonts)

• [x] Base Font: Roboto
• [x] Code font: Source Code Pro
• [x] Heading Font: Roboto Condensed

Thanks a lot :)