Fixed open in tab by using HTML docs baseURI so the deployed path is included in links.

[sei-mpriest]

Fixed this using the HTML doc's baseURI in the window.open links. I tried to find an idiomatic way to do this via the Angular router, but that did not seem to work. I believe that a routerLink directive would correctly take the base href setting in index.html into account, but it does not seem to when doing a call via ts code. For example, this code did not work:

  const urlTree = this.router.createUrlTree([
              '/exhibit',
              this.exhibit.id,
              'article',
              userArticle.articleId,
            ]);
  const url = this.router.serializeUrl(urlTree); 
  window.open(url);

My actual fix was borrowed from @sei-aschlackman:

  const url =
              document.baseURI +
              '/exhibit/' +
              this.exhibit.id +
              '/article/' +
              userArticle.articleId;
  window.open(url);

I tested this by changing my index.html to include

<base href="/myapp/">

I ran ng serve with the --serve-path argument to get it to serve at that path as well

ng serve  --serve-path /myapp/