CRDs and godoc reference for main projects

[SafeEHA]

• Created a sidebar structure in SUMMARY.md for main project reference guides
• Added https://pkg.go.dev/ and https://doc.crds.dev/ links to main projects

cc:@lentzi90

[metal3-io-bot]

Hi @SafeEHA. Thanks for your PR.

I'm waiting for a metal3-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[tuminoid]

/ok-to-test

[tuminoid]

Great! Please squash the commits, then we can merge /approve

Can you squash the commits, so we can merget this? @SafeEHA

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lentzi90

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/metal3-io/metal3-docs/blob/main/OWNERS)~~ [lentzi90] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[SafeEHA]

Done @tuminoid apologies this took so long

[dtantsur]

Late to the party, but could someone please address the feedback?