build(deps): update dependencies (#2301)

* Bump flow version

* Bump jest version

* Bump eslint version

* Bump rollup version

* Bump webpack version

* Bump misc dependencies and update lockfile

* Update lockfile

* Bump commander version

* Bump misc dependencies

* Bump istanbul version

* Bump docusaurus version

* Update lockfile

* Explicitly declare dependencies

* Bump caniuse-lite version

* Update lockfile

* Bump commander version

* Bump webpack and css-loader version

* Bump flow version

website/static/js/scrollspy.js

@@ -1,52 +0,0 @@
-/* eslint-disable no-var */
-// Inspired by ScrollSpy as in e.g. Bootstrap
-
-(function() {
-    var OFFSET = 10;
-    var timer;
-
-    var headingsCache;
-    function findHeadings() {
-        return headingsCache ? headingsCache :
-            document.querySelectorAll('.toc-headings > li > a');
-    }
-
-    function onScroll() {
-        if (timer) {  // throttle
-            return;
-        }
-        timer = setTimeout(function() {
-            timer = null;
-            var found = false;
-            var headings = findHeadings();
-            for (var i = 0; i < headings.length; i++) {
-                // if !found and i is the last element, highlight the last
-                var current = !found;
-                if (!found && i < headings.length - 1) {
-                    var next = headings[i + 1].href.split('#')[1];
-                    var nextHeader = document.getElementById(next);
-                    var top = nextHeader.getBoundingClientRect().top;
-                    // The following tests whether top + scrollTop
-                    // (the top of the header) is greater than scrollTop
-                    // (where scrollTop = window.pageYOffset, the top of
-                    // the window), with OFFSET pixels of slop.
-                    current = top > OFFSET;
-                }
-                if (current) {
-                    found = true;
-                    headings[i].className = "active";
-                } else {
-                    headings[i].className = "";
-                }
-            }
-        }, 100);
-    }
-
-    document.addEventListener('scroll', onScroll);
-    document.addEventListener('resize', onScroll);
-    document.addEventListener('DOMContentLoaded', function() {
-        // Cache the headings once the page has fully loaded.
-        headingsCache = findHeadings();
-        onScroll();
-    });
-})();