docs(readme): update README with See Also section

[andrewazores]

Welcome to Cryostat3! 👋

Before contributing, make sure you have:

• [x] Read the contributing guidelines
• [x] Linked a relevant issue which this PR resolves
• [x] Linked any other relevant issues, PR's, or documentation, if any
• [x] Resolved all conflicts, if any
• [x] Rebased your branch PR on top of the latest upstream main branch
• [x] Attached at least one of the following labels to the PR: [chore, ci, docs, feat, fix, test]
• [x] Signed all commits using a GPG signature

To recreate commits with GPG signature git fetch upstream && git rebase --force --gpg-sign upstream/main

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Related to #469

See the old README at https://github.com/cryostatio/cryostat . This updates 3.0's README to copy some of the missing content over, such as the See Also section.