docs(docs): add initial Fumadocs-based documentation site

docs/src/styles/globals.css

@@ -0,0 +1,16 @@
+@import "tailwindcss";
+@import "fumadocs-ui/css/solar.css";
+@import "fumadocs-ui/css/preset.css";
+
+html {
+  scrollbar-gutter: stable;
+}
+
+html > body[data-scroll-locked] {
+  margin-right: 0px !important;
+  --removed-body-scroll-bar-size: 0px !important;
+}
+
+:root {
+  --fd-layout-width: 1400px;
+}