Set page title for each Apicurio UI page

[EricWittmann]

Currently we don't change the title of the page in the Apicurio UI when the user navigates around the app. This results in a useless browser History. We should set a sensible page title for each page. I assume this is possible in angular. In many cases we'll need to use dynamically loaded information (e.g. the API title) that isn't available on initial navigation. Hopefully there is a way to update the page title after the relevant data has loaded...

[EricWittmann]

Some possible info on how to do this in angular: https://angular.io/guide/set-document-title