Provide additional reference links

[marsjaninzmarsa]

Mozilla Developer Network, Chrome Platform Status etc...

[SebastianZ]

I have just added individual spec. links to each feature, which paved the way to add more reference info to them.

With more reference links added the current badge-style display will quickly look too crowded, so I guess there needs to be another way to display this information. E.g. instead of having the links directly besides the spec. names and features, there could be an info icon. Clicking that icon would open up a tooltip with the links (and maybe more info in the future).

Sebastian