docs: added a list of links to the tutorials included in 'Get Started'

[MANAVBHOSALE]

Description of change

This fixes #3867 by adding all the sections required for 'Get Started'.

Description

Have added a list of tutorials for 'Get Started' section same as that of the landing pages for other major sections have a high-level summary of the contents so this would match.

Checklist

• My PR fulfills the Definition of Done of the corresponding issue and not more (or parts if the issue is separated
  into multiple PRs)
• I used descriptive commit messages to help reviewers understand my thought process
• I signed off all my commits according to the Developer Certificate of Origin (DCO)
  see Contribution Guide
• My PR title is formatted according to the semantic PR conventions described in
  the Contribution Guide
• My code follows the style guidelines of this project (golangci-lint passes, YAMLLint passes)
• I regenerated the auto-generated docs for Helm and the CRD documentation (if applicable)
• I have performed a self-review of my code
• I have made corresponding changes to the documentation (if needed)
• My changes result in all-green PR checks (first-time contributors need to ask a maintainer to approve their test runs)
• New and existing unit and integration tests pass locally with my changes

[StackScribe]

Suggested change

	This section provides tutorials to familiarize you
	with some basic Keptn features
	and point you to other documentation that has more comprehensive information.

These lines duplicate text that is already there.

[StackScribe]

Suggested change

	Keptn's Release Lifecycle Management tools enhance your cloud-native deployments by
	Keptn's Release Lifecycle Management tools can enhance your cloud-native deployments by

[StackScribe]

Suggested change

	It builds on the **Getting Started with Keptn Observability** exercise, so completing
	that first is recommended.
	It builds on the **Getting Started with Keptn Observability** exercise,
	so you should complete that exercise before attempting this one.

[StackScribe]

This is a very nice enhancement to the docs. Thank you for putting it together!

I made a couple small suggestions. You need to fix the semantic error and whatever is causing readthedocs to fail and I will approve.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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