docs: add KeptnTaskDefinition tutorial

[agardnerIT]

This PR:

• Expands the "tutorial series" beyond "getting started"

After the getting started guide, Keptn users will have DORA metrics and this is the next logical step - implementing KeptnTasks.

This tutorial demonstrates how to add post tasks.

Out of scope

• Do not explain app level tasks on this page - that's out of scope
• Evaluations will form the next step in the tutorial series - evalautions are out of scope for this page as they require a thorough explanation of the metrics server

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[agardnerIT]

@aepfli why is this PR title invalid? Why can't it start with an uppercase letter?

Error: The subject "KeptnTaskDefinition tutorial" found in the pull request title "docs: KeptnTaskDefinition tutorial"
didn't match the configured pattern. Please ensure that the subject
doesn't start with an uppercase character.

[aepfli]

@aepfli why is this PR title invalid? Why can't it start with an uppercase letter?

Error: The subject "KeptnTaskDefinition tutorial" found in the pull request title "docs: KeptnTaskDefinition tutorial"
didn't match the configured pattern. Please ensure that the subject
doesn't start with an uppercase character.

That is in fact something I stumbled upon regularly too, and it has to be done with the conventional commit setup.

@mowies maybe has some more insights, as this has been active on keptn before I contributed.

[sonarcloud]

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