www: fix links in the about page

Somehow <Link> forces relative links and breaks external URLs
(ex: https://buildbot.buildbot.net/#/about/http://buildbot.net). It
might be fixed with react-router 6.7.1 [1], while I prefer to just use
basic `<a>`.

While I'm at it, I also updated the link to use HTTPS.

[1] remix-run/react-router#9900

www/base/src/views/AboutView/AboutView.tsx

@@ -88,8 +88,8 @@ export const AboutView = observer(() => {
         <Card.Body>
           <h2>
             <img src="icon.svg" alt="" width="64px" className="nut-spin"/>&nbsp;About this&nbsp;
-            <Link to="http://buildbot.net">buildbot</Link>&nbsp;running for&nbsp;
-            <Link to={config.titleURL}>{config.title}</Link>
+            <a href="https://buildbot.net">buildbot</a>&nbsp;running for&nbsp;
+            <a href={config.titleURL}>{config.title}</a>
           </h2>
           <div className="col-sm-12">
             <ul>