Update build step; Add Serendipity Bio to vendors list and wizard.

[bmwe30is]

• Update build step
• Add Serendipity Bio to the vendors list
• Add Serendipity Bio to the wizard.

[bewest]

Welcome to serendipity, but I think this needs some work. If we're going to start counting stuff coming soon, there will be too many questionable additions. Suggest staying away from "soon" and "some" descriptions as they are extremely confusing without some way to quantify.

[psonnera]

@bewest fixed in https://github.com/nightscout/nightscout.github.io/commit/f3dc2a84cebeca01a22b206245f7169d8882ce4a

[bmwe30is]

Agreed, I could totally see how it opens up to ambiguity.