feat(i18n): homepage link for 404 pages (#1117)

* Add homepage link with internationalization

* Construct pathname from baseUrl config value

* More robust URL manipulation

* Add Farsi (#1133)

* Fix bad rebase

quartz/components/pages/404.tsx

@@ -2,10 +2,15 @@ import { i18n } from "../../i18n"
 import { QuartzComponent, QuartzComponentConstructor, QuartzComponentProps } from "../types"
 
 const NotFound: QuartzComponent = ({ cfg }: QuartzComponentProps) => {
+  // If baseUrl contains a pathname after the domain, use this as the home link
+  const url = new URL(`https://${cfg.baseUrl ?? "example.com"}`)
+  const baseDir = url.pathname
+
   return (
     <article class="popover-hint">
       <h1>404</h1>
       <p>{i18n(cfg.locale).pages.error.notFound}</p>
+      <a href={baseDir}>{i18n(cfg.locale).pages.error.home}</a>
     </article>
   )
 }