Using new doxygen theme

using https://github.com/jothepro/doxygen-awesome-css

modified:   Doxyfile

new file: doxygen-awesome-sidebar-only.css new file: doxygen-awesome.css new file: doxygen-custom/custom.css new file: doxygen-custom/header.html

docs/doxygen-custom/custom.css

+.github-corner svg {
+    fill: var(--primary-light-color);
+    color: var(--page-background-color);
+    width: 72px;
+    height: 72px;
+}
+
+#projectnumber {
+    margin-right: 25px;
+}
+
+@media screen and (max-width: 767px) {
+    .github-corner svg {
+        width: 55px;
+        height: 55px;
+    }
+}
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