properly use base_url macro and set it for github mirror

.github/workflows/docs.yml

         run: |
           rm -rf output
           mkdir output
+          sed -i 's|https://www.xythobuz.de|https://xythobuz.github.io|g' macros.py
           ./poole.py --build
           cp -r static/* output/
 

README.md

 To run a local test instance call the `localtest.sh` script.
 This is also a good starting point for integration into a CI workflow.
 
-Includes [SHJS](https://shjs.sourceforge.net/) and [llightGallery](https://github.com/sachinchoolur/lightGallery).
+An automated cloud mirror on GitHub is available on [xythobuz.github.io](https://xythobuz.github.io).
+
+Includes [SHJS](https://shjs.sourceforge.net/) and [lightGallery](https://github.com/sachinchoolur/lightGallery).
 
 ## To Do
 

macros.py

     fp = open(os.path.join(options.project, "output", "index.php"), 'w')
     fp.write("<?\n")
     fp.write("// Auto generated xyCMS compatibility index.php\n")
-    fp.write("$loc = 'https://www.xythobuz.de/index.de.html';\n")
+    fp.write("$loc = '" + get_conf("base_url") + "/index.de.html';\n")
     fp.write("if (isset($_GET['p'])) {\n")
     fp.write("    if (isset($_GET['lang'])) {\n")
     fp.write("        $_GET['p'] .= 'EN';\n")
             tmp = p["compat"]
             if p.get("lang", DEFAULT_LANG) == DEFAULT_LANG:
                 tmp = tmp + "EN"
-            fp.write(_COMPAT % (tmp, "https://www.xythobuz.de", p.url))
+            fp.write(_COMPAT % (tmp, get_conf("base_url"), p.url))
             fp.write("\n")
     fp.write(_COMPAT_404 % "/404.html")
     fp.write("    }\n")
     fp = codecs.open(os.path.join(directory, "index.php"), "w", "utf-8")
     fp.write("<?\n")
     fp.write("// Auto generated xyCMS compatibility mobile/index.php\n")
-    fp.write("$loc = 'https://www.xythobuz.de/index.de.html';\n")
+    fp.write("$loc = '" + get_conf("base_url") + "/index.de.html';\n")
     fp.write("if (isset($_GET['p'])) {\n")
     fp.write("    if (isset($_GET['lang'])) {\n")
     fp.write("        $_GET['p'] .= 'EN';\n")
             tmp = p["compat"]
             if p.get("lang", DEFAULT_LANG) == DEFAULT_LANG:
                 tmp = tmp + "EN"
-            fp.write(_COMPAT_MOB % (tmp, "https://www.xythobuz.de", re.sub(".html", ".html", p.url)))
+            fp.write(_COMPAT_MOB % (tmp, get_conf("base_url"), re.sub(".html", ".html", p.url)))
             fp.write("\n")
     fp.write(_COMPAT_404_MOB % "/404.mob.html")
     fp.write("    }\n")