Docs: new documentation site (#2723)

This commit adds a VitePress build to the main repository,
aiming to ditch GitHub Wiki. Moving further, we're going to
host our own documentation site eithor on GitHub Pages or
something alike.

docs/package.json

@@ -0,0 +1,13 @@
+{
+  "scripts": {
+    "docs:dev": "vitepress dev docs",
+    "docs:build": "vitepress build docs",
+    "docs:preview": "vitepress preview docs"
+  },
+  "devDependencies": {
+    "@types/node": "^20.1.4",
+    "directory-tree": "^3.5.1",
+    "markdown-yaml-metadata-parser": "^3.0.0",
+    "vitepress": "^1.0.0-alpha.75"
+  }
+}