refactoring of code to support themes and new hellug theme

themes/hellug-minimal/static/css/hellug.css

@@ -0,0 +1,37 @@
+body {
+  grid-template-columns: 1fr min(70rem, 90%) 1fr;
+}
+
+main {
+    display: grid;
+    gap: 30px 80px;
+    grid-template-columns: min(70%) auto;
+
+}
+
+article {
+  border: 0px solid var(--border);
+}
+
+.sitemap {
+display: flex;
+align-items: normal;
+justify-content: space-around;
+flex-wrap: wrap;
+}
+
+.sitemap-item {
+    text-align: left;
+    vertical-align: top;
+}
+
+.master {
+grid-column-start 1;
+}
+.sidebar {
+grid-column-start 3;
+}
+
+main h3, h4 {
+margin-bottom: 0.1em;
+}