Assorted scripts for development

This directory contains several scripts useful in the development process of Tekton Pipelines.

update-codegen.sh: Updates auto-generated client libraries.
update-deps.sh: Updates Go dependencies.
update-openapigen.sh: Updates OpenAPI specification and Swagger file.
verify-codegen.sh: Verifies that auto-generated client libraries are up-to-date.
update-reference-docs.sh and related files: Generates docs/pipeline-api.md.
- reference-docs-gen-config.json is the configuration file for the gen-api-reference-docs binary.
- reference-docs-template contains Go templates for the generated Markdown.
Release docs have been moved to the top-level tekton dir

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