docs: milestones (#4593)

* docs: milestones

* fix: light mode

* feat: dates and links

* use item interface from timeline

* fix ssr build

* responseive design and styling

---------

Co-authored-by: martabal <74269598+martabal@users.noreply.github.com>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

docs/package.json

@@ -19,6 +19,8 @@
   "dependencies": {
     "@docusaurus/core": "^2.4.3",
     "@docusaurus/preset-classic": "^2.4.3",
+    "@mdi/js": "^7.3.67",
+    "@mdi/react": "^1.6.1",
     "@mdx-js/react": "^1.6.22",
     "autoprefixer": "^10.4.13",
     "classnames": "^2.3.2",