Make instructions in DEVELOPMENT guide work about triggers HOT 4 CLOSED

@bobcatfish to clarify, are we making it possible to install triggers independently from pipeline? If so, we'll need to add yaml for our own Namespace, ClusterRole, ServiceAccount, ClusterRoleBinding, etc. (some of these might be duplicates from pipeline; for example, the Namespace could be the same yaml file that's in pipeline?).

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I followed up with @bobcatfish about my previous comment, and I will proceed with this issue under the assumption that users can install triggers without having installed pipelines (although they will work best together). The triggers project will be installed into the tekton-pipelines namespace, but will use its own ServiceAccount.

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Closing this issue now that ko apply -f config/ works, the hack directory (with update-deps and update-codegen) works, and the skeleton controller & webhook exist.

Relevant PRs:

• docs update: #30
• skeleton webhook: #21
• skeleton controller: #18
• types & hack code: #17

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niiiiice 🎉

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