Switch to Node.js 16 LTS, upgrade TypeScript, ESLint, and other dependencies (#395)

* Upgrade TypeScript, ESLint, and other dependencies

This also cleans up various other files where newer ESLint rules complained

* Set CI and CD to use Node.js version 16

* Small tweak

* Fix CD version printing

* Add nvm version for Cloudflare Pages

frontend/src/components/widgets/buttons/IconButton.vue

@@ -15,10 +15,9 @@
 	border: none;
 	border-radius: 2px;
 	background: none;
-	vertical-align: top;
 	fill: var(--color-e-nearwhite);
 
-	// The `where` pseduo-class does not contribtue to specificity
+	// The `where` pseudo-class does not contribtue to specificity
 	& + :where(.icon-button) {
 		margin-left: 0;
 	}

frontend/src/components/widgets/buttons/PopoverButton.vue

@@ -26,7 +26,6 @@
 		outline: none;
 		border: none;
 		border-radius: 2px;
-		vertical-align: top;
 		background: var(--color-1-nearblack);
 		fill: var(--color-e-nearwhite);