Fix linkify to only link to proper URLs

This doesn't check for really well formed URLs, but it limits the matching to
only allowed characters in URIs.
It makes up for escapeForHtml() being already called, so it matches `&`
separately.

Tested with:

    # '"> should be excluded
    'https://github.com/os-autoinst/openQA'
    "https://github.com/os-autoinst/openQA.git"
    <https://github.com/os-autoinst/os-autoinst.git>
    # ) should be included
    https://de.wikipedia.org/wiki/Queen_(Band)
    # query strings should be included
    https://github.com/os-autoinst/openQA?foo=1%20&bar=*2

assets/javascripts/anser-import.js

@@ -1,7 +1,14 @@
 const module = {};
 
+// https://datatracker.ietf.org/doc/html/rfc3986#appendix-A
+function linkify(txt) {
+  const re = /(https?:\/\/(?:[A-Za-z0-9#;/?:@=+$,_.!~*()[\]-]|&|%[A-Ea-a0-9]{2})+)/gm;
+  return txt.replace(re, function (str) {
+    return '<a href="' + str + '">' + str + '</a>';
+  });
+}
 function ansiToHtml(data) {
-  return Anser.linkify(Anser.ansiToHtml(Anser.escapeForHtml(data), {use_classes: true}));
+  return linkify(Anser.ansiToHtml(Anser.escapeForHtml(data), {use_classes: true}));
 }
 function ansiToText(data) {
   return Anser.ansiToText(data);