Removed 404 link on docs

[ByronKweh]

Removed - High Level Architecture — Building a Meeting Application With the Amazon Chime SDK

From the readme as it is no longer available.

Issue #:

Description of changes:

Testing:

Can these tested using a demo application? Please provide reproducible step-by-step instructions.

Checklist:

1. Have you successfully run npm run build:release locally?

2. Do you add, modify, or delete public API definitions? If yes, has that been reviewed and approved?

3. Do you change the wire protocol, e.g. the request method? If yes, has that been reviewed and approved?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.