build: add mkdocs setup

basic mkdocs setup with initial set of documentation

Author: georgeRobertson

docs/advanced_guidance/backends.md

@@ -0,0 +1,5 @@
+::: dve.core_engine.engine.CoreEngine
+    handler: python
+    options:
+        show_root_heading: false
+        show_source: true

docs/advanced_guidance/code_docs/core_engine.md

@@ -0,0 +1,42 @@
+:root {
+  --nhs-blue: #005EB8
+}
+
+.md-footer-meta {
+  background-color: transparent !important;
+  box-shadow: none;
+}
+
+.md-footer-meta::before {
+  content: "";
+  display: block;
+  height: 3px;
+  background-color: var(--nhs-blue);
+}
+
+.md-footer-meta.md-typeset a svg {
+  transition: transform 0.2s ease, filter 0.2s ease;
+}
+
+.md-footer-meta.md-typeset a:hover svg {
+  transform: scale(1.12);
+  filter: brightness(1.2) drop-shadow(0 0 6px rgba(30, 136, 229, 0.7));
+}
+
+/* Light mode */
+[data-md-color-scheme="default"] {
+  --md-primary-fg-color: var(--nhs-blue);
+  --md-footer-bg-color: var(--md-default-bg-color);
+  --md-footer-fg-color: #000000;
+  --md-footer-fg-color--light: #333333;
+  --md-footer-fg-color--lighter: #555555;
+}
+
+/* Dark mode */
+[data-md-color-scheme="slate"] {
+  --md-primary-fg-color:var(--nhs-blue);
+  --md-footer-bg-color: var(--md-default-bg-color);
+  --md-footer-fg-color: #e0e0e0;
+  --md-footer-fg-color--light: #bdbdbd;
+  --md-footer-fg-color--lighter: #9e9e9e;
+}