feat(article): Scrollspy for the table of contents (#425)

* Add first try at scrollspy (broken right now)

* Scrollspy actually works now

* Fix VS Code errors by setting JS version

* Recompute offsets when window size changes

* Improve list compatibility for toc active selection

Support up to 6 levels of indentation, properly support <ol>

* Remove debug string

* Add more docs in smoothAnchors

* Use a map to match ids to navigation elements

assets/ts/main.ts

@@ -10,6 +10,8 @@ import { getColor } from 'ts/color';
 import menu from 'ts/menu';
 import createElement from 'ts/createElement';
 import StackColorScheme from 'ts/colorScheme';
+import { setupScrollspy } from 'ts/scrollspy';
+import { setupSmoothAnchors } from "ts/smoothAnchors";
 
 let Stack = {
     init: () => {
@@ -21,6 +23,8 @@ let Stack = {
         const articleContent = document.querySelector('.article-content') as HTMLElement;
         if (articleContent) {
             new StackGallery(articleContent);
+            setupSmoothAnchors();
+            setupScrollspy();
         }
 
         /**