refactor(docs-infra): remove unnecessary tsconfig.json file (#43818)

the tsconfig.json file in aio/content/examples does not seem necessary
anymore as it was only used for tslinting and tslint has been removed
from the examples in PR #43592 and PR #43746

PR Close #43818

aio/content/examples/tsconfig.json

@@ -1,20 +0,0 @@
-// this tsconfig is used to give intellisense to
-// all the examples in this folder
-{
-  "compilerOptions": {
-    "target": "es6",
-    "module": "commonjs",
-    "moduleResolution": "node",
-    "sourceMap": true,
-    "experimentalDecorators": true,
-    "lib": ["es2015", "dom"],
-    "noImplicitAny": true,
-    "suppressImplicitAnyIndexErrors": true,
-    "typeRoots": [
-      "../../tools/examples/shared/node_modules/@types"
-    ]
-  },
-  "include": [
-    "*/e2e-spec.ts"
-  ]
-}