[WEB-4489] chore: disable personal keys on examples

[jamiehenson]

This pull request refactors the handling of API keys in the examples page template and removes unused code related to user context and API key retrieval. The changes simplify the codebase by replacing dynamic API key logic with a static environment variable and removing unnecessary imports and functions.

Review app (it's a random website dependabot env, but it points to the right docs - log in as normal): https://website-dependabot-npm--7ueyw3.herokuapp.com/examples

Acceptance: it should work and say it's using the demo key in the Sandpack window footer

Refactoring API key handling:

• Replaced the dynamic API key retrieval logic using UserContext and getApiKey with a static demo key sourced from the GATSBY_VITE_ABLY_KEY environment variable in src/templates/examples.tsx. This is a temporary solution until a better approach is implemented.

Code cleanup:

• Removed the unused UserContext import and the getApiKey function from src/templates/examples.tsx.
• Deleted the getApiKey function and its related import from src/utilities/update-ably-connection-keys.ts, as it is no longer used.
• Removed the unused useContext import from src/templates/examples.tsx.

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