Add anchors and table of contents to period summary

[amdw]

Now the summary report has multiple panes, a table of contents and a set of internal anchor links would be very useful.

[amdw]

Unfortunately it's not easy to make this work, because the elements to which we want to attach anchors are only available after an asynchronous data load. This is a well-known issue in Angular.

Even using router anchorScrolling doesn't seem to work for me.

https://angular.io/api/router/ExtraOptions#anchorScrolling

Even when I add a link and click it after the page has loaded, it doesn't work. I suspect the issue may be the following:

angular/angular#33240

The only thing I could make work was modifying the URL in the browser address bar to add the hash-fragment after the page has loaded, which is obviously useless.

There are some workarounds, but it might be better just to wait until Angular improves its capabilities in this area.