Draw a diagram for the Web UI

[Mec-iS]

As we said in the call:

• UI should have a banner with a short presentation of the application: "Hydra Astrodemo: Satellite Assemblying with Smart Clients"
• The application should have two main part: one for demonstrating the GET functionality on all the collections using a DSL mini-language; the second one for demonstrating the querying functionality using a DSL mini-language

A mockup should be worked and improved.

[xadahiya]

This should accomplish all the things we need our demo to do. @Mec-iS @vaibhavchellani @sandeepsajan0 @chrizandr please let me know your thoughts on this.

[xadahiya]

@sandeepsajan0 @vaibhavchellani the UI still needs a lot of work. Please use the mockups provided above to fix the UI.