[ui] Add link icon

[vrachieru]

Add an icon on the left side of each link describing the type of resource.
For example:

• a link from the github.[com|io|etc] domain would have the github icon
• a link that pints dirrectly to a .[jpg|png|gif|etc] should have an image icon

[chalx]

@vrachieru to do this we need to modify the python script and add some more data to json. Or we can create another json file which will contain some associations:

{
  "(.*)github(.*)": "http://tech.zumba.com/img/github.png",
  "(.*).pdf$": "a pdf icon"
}

And so on