Examples: Remove refs in angular example

[ndelangen]

we're tired of seeing this:

ERR! FetchError: request to https://storybookjs.netlify.app/cra-ts-essentials/iframe.html failed, reason: Client network socket disconnected before secure TLS connection was established
ERR!     at ClientRequest.<anonymous> (/tmp/storybook/code/node_modules/node-fetch/lib/index.js:1491:11)
ERR!     at ClientRequest.emit (events.js:400:28)
ERR!     at TLSSocket.socketErrorListener (_http_client.js:475:9)
ERR!     at TLSSocket.emit (events.js:400:28)
ERR!     at emitErrorNT (internal/streams/destroy.js:106:8)
ERR!     at emitErrorCloseNT (internal/streams/destroy.js:74:3)
ERR!     at processTicksAndRejections (internal/process/task_queues.js:82:21)
ERR!  FetchError: request to https://storybookjs.netlify.app/cra-ts-essentials/iframe.html failed, reason: Client network socket disconnected before secure TLS connection was established
ERR!     at ClientRequest.<anonymous> (/tmp/storybook/code/node_modules/node-fetch/lib/index.js:1491:11)
ERR!     at ClientRequest.emit (events.js:400:28)
ERR!     at TLSSocket.socketErrorListener (_http_client.js:475:9)
ERR!     at TLSSocket.emit (events.js:400:28)
ERR!     at emitErrorNT (internal/streams/destroy.js:106:8)
ERR!     at emitErrorCloseNT (internal/streams/destroy.js:74:3)
ERR!     at processTicksAndRejections (internal/process/task_queues.js:82:21) {
ERR!   type: 'system',
ERR!   errno: 'ECONNRESET',
ERR!   code: 'ECONNRESET'
ERR! }

[MichaelArestad]

Nice work @ndelangen! Thank you for contributing to Storybook!