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/.eslintrc.js

@@ -63,11 +63,14 @@ module.exports = {
 		"no-debugger": process.env.NODE_ENV === "production" ? "warn" : "off",
 		"no-param-reassign": ["error", { props: false }],
 		"no-bitwise": "off",
+		"no-shadow": "off",
+		"no-use-before-define": "off",
 
 		// TypeScript plugin config
 		"@typescript-eslint/camelcase": "off",
 		"@typescript-eslint/no-use-before-define": "off",
 		"@typescript-eslint/no-unused-vars": ["error", { argsIgnorePattern: "^_" }],
+		"@typescript-eslint/no-loss-of-precision": "off", // TODO: Remove this line after upgrading to eslint 7.1 or greater
 
 		// Import plugin config (used to intelligently validate module import statements)
 		"import/prefer-default-export": "off",
@@ -81,5 +84,8 @@ module.exports = {
 				printWidth: 200,
 			},
 		],
+
+		// Vue plugin config (used to validate Vue single-file components)
+		"vue/multi-word-component-names": "off",
 	},
 };