feat(cdr): Initial UI scaffolding

This is testing out [Approach 3](https://www.notion.so/coderhq/Workspaces-v2-Initial-UI-Scaffolding-3b07d2847eed48839a7e6f0f2bb9bf56#56256f25d2954897a8ee315f0820cedd) in the UI scaffolding RFC.

Fixes https://github.com/coder/coder/issues/11

The folder structure looks like:
- `site`
    - `components` (buttons, empty state, etc)
    - `pages` (large sections of UI -> composition of components)
    - `theme` (files defining our palette)

Several components were able to be brought in essentially unmodified:
- `SplitButton`
- `EmptyState`
- `Footer`
-  All the icons / logos
- Theming (removed several items that aren't necessary, yet, though)

Other components had more coupling, and need more refactoring:
- `NavBar`
- `Confetti`

Current State:

![2022-01-06 17 16 31](https://user-images.githubusercontent.com/88213859/148475521-96e080cc-1d33-4b8e-a434-29e388936e3f.gif)

For a full working app, there's potentially a lot more to bring in:
- User / Account Settings Stuff
- Users Page
- Organizations Page
(and all the supporting dependencies)

package.json

@@ -4,10 +4,25 @@
   "repository": "https://github.com/coder/coder",
   "private": true,
   "scripts": {
+    "build": "NODE_ENV=production next build site",
+    "build:dev": "next build site",
+    "dev": "next dev site",
     "format:check": "prettier --check '**/*.{css,html,js,json,jsx,md,ts,tsx,yaml,yml}'",
-    "format:write": "prettier --write '**/*.{css,htmljs,json,jsx,md,ts,tsx,yaml,yml}'"
+    "format:write": "prettier --write '**/*.{css,html,js,json,jsx,md,ts,tsx,yaml,yml}'"
   },
   "devDependencies": {
-    "prettier": "2.5.1"
+    "@material-ui/core": "4.9.4",
+    "@material-ui/icons": "4.5.1",
+    "@material-ui/lab": "4.0.0-alpha.42",
+    "@types/node": "14.18.4",
+    "@types/react": "17.0.38",
+    "@types/react-dom": "17.0.11",
+    "@types/superagent": "4.1.14",
+    "next": "12.0.7",
+    "prettier": "2.5.1",
+    "react": "17.0.2",
+    "react-dom": "17.0.2",
+    "ts-loader": "9.2.6",
+    "typescript": "4.5.4"
   }
 }