Readme update and adjustments to trigger request and node IO

[LZylstra]

Addresses:

• https://github.com/directus/n8n-nodes-directus/blob/master/nodes/DirectusTrigger/methods/webhookMethods.ts#L111 - Replace httpRequest with httpRequestWithAuthentication this will then use the authentication options set in the credential file so you don't need to add the headers manually.
• https://github.com/directus/n8n-nodes-directus/blob/master/nodes/Directus/Directus.node.ts#L51 - Inputs / Outputs should be [NodeConnectionTypes.Main]

[Copilot]

Pull request overview

This PR modernizes the authentication approach and improves code maintainability by replacing manual authentication headers with n8n's built-in authenticated request helper, updating node I/O types to use the proper enum constant, switching from process forks to threads in testing configuration, and simplifying the README by removing outdated development documentation.

• Replaced httpRequest with httpRequestWithAuthentication throughout webhook methods, leveraging credential-based authentication
• Updated node inputs/outputs from string literals to NodeConnectionTypes.Main enum
• Changed Vitest pool configuration from 'forks' to 'threads' for better test execution

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
vitest.config.ts	Switched test pool from 'forks' to 'threads' with corresponding option updates
nodes/DirectusTrigger/methods/webhookMethods.ts	Replaced all httpRequest calls with httpRequestWithAuthentication, removing manual Authorization headers
nodes/Directus/Directus.node.ts	Updated inputs/outputs to use NodeConnectionTypes.Main enum instead of string literals
tests/helpers.ts	Added mock implementation for httpRequestWithAuthentication helper method
tests/DirectusTrigger.node.test.ts	Updated test assertions to use new method name and correct argument indexing (call[1] instead of call[0])
tests/Directus.node.test.ts	Fixed indentation/formatting of file operation test cases
README.md	Removed outdated development documentation sections and troubleshooting content

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