docs: rename "tasks" page, delete section from "Tutorials"

[StackScribe]

This PR should be merged after #2089 has been merged, since this PR deletes the tutorials directory and PR2089 moves the other file out of that directory.

This PR:

• Renames the "Working with Keptn tasks" page (https://deploy-preview-2049--keptn-lifecycle-toolkit.netlify.app/docs/implementing/tasks/ ) to be "Deployment tasks"
• Calls out the definition of pre- and post-deployment tasks into a bullet list
• Deletes the "Add Deployment" page (https://deploy-preview-2049--keptn-lifecycle-toolkit.netlify.app/docs/tutorials/add-tasks/ )
• Deletes the "Tutorials" section (the other file in there is moved to "Implementing" in docs: move/expand "Keptn for Non-Kubernetes applications" #2086 )

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[agardnerIT]

I'm confused. I thought we agreed to implement the tutorials section. This is a new section with the intention that users "flow" from the getting started guide into one of the tutoriuals (probably the pre/post tasks). Also, the tutorials can stand on their own as "quick references" for existing users who need a refresher on "how do I add a pre-evaluation"?

I'm not too precious on the word "tutorials" though if you prefer another descriptor.

[StackScribe]

So who was involved in the discussion about adding the Tutorials section? I apologize -- I did not know about this. But I'm not clear how this section would relate to what is in the "Implementing" section -- which I am proposing we rename to be "User Guide". The current content has the information about using Keptn to run tasks for software that is deployed on a VM or something other than k8s, which does not seem like something we would use as just a step up from the "Getting Started Guide.

I am thinking that we need a second "Getting Started" exercise for the Release Lifecycle Management feature -- I think that is the name for it. Basically pre- and post-deployment tasks. So something that has them define some tasks and evaluations, create a simple KeptnApp, annotate it for the pre- and post-deployment tasks. And from there, they should be ready to use the main "User guide" pages, right?

[RealAnna]

@StackScribe and @agardnerIT we just merged this #2121 so the pr will have conflicts now

[sonarcloud]

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