Ottoman Travel Sample App

We should add an Ottoman Travel Sample app in the near future and add a page for it in our docs. 

We may need two versions, one for Ottoman + Node.js and one for Typescript + Ottoman...

The JS/TS backends already exist, but they might not conform to our api contract for the travel-sample UI as well as running in docker etc.

Below are the existing backend sample applications:

• https://github.com/couchbaselabs/try-ottoman-ts 
• https://github.com/couchbaselabs/try-ottoman