build: IDE errors in docs site

Fixes that we had a bunch of errors in the IDE for the docs site, because it couldn't resolve the paths to the Material components.

Author: crisbeto

docs/tsconfig.json

@@ -22,7 +22,25 @@
     "strictBindCallApply": true,
     "strictFunctionTypes": true,
     "strictPropertyInitialization": true,
-    "useDefineForClassFields": false
+    "useDefineForClassFields": false,
+    "paths": {
+      "@angular/aria": ["../src/aria"],
+      "@angular/aria/*": ["../src/aria/*"],
+      "@angular/cdk": ["../src/cdk"],
+      "@angular/cdk/*": ["../src/cdk/*"],
+      "@angular/material/*": ["../src/material/*"],
+      "@angular/material-experimental/*": ["../src/material-experimental/*"],
+      "@angular/material-experimental": ["../src/material-experimental"],
+      "@angular/cdk-experimental/*": ["../src/cdk-experimental/*"],
+      "@angular/cdk-experimental": ["../src/cdk-experimental"],
+      "@angular/material-moment-adapter": ["../src/material-moment-adapter"],
+      "@angular/material-luxon-adapter": ["../src/material-luxon-adapter"],
+      "@angular/material-date-fns-adapter": ["../src/material-date-fns-adapter"],
+      "@angular/components-examples": ["../src/components-examples"],
+      "@angular/components-examples/*": ["../src/components-examples/*"],
+      "@angular/google-maps": ["../src/google-maps"],
+      "@angular/youtube-player": ["../src/youtube-player"]
+    }
   },
   "exclude": ["src/assets", "dist", "bazel-*"],
   "angularCompilerOptions": {