chore: add release checklist doc

docs/release-checklist.md

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+# Release Checklist
+
+This document outlines the steps required to prepare a new release of `modern-cv`.
+
+Steps:
+
+1. Create a new release branch with the format `release/x.y.z`.
+2. Update the version in the `typst.toml`.
+3. Update examples in the [README.md](../README.md) to reflect the new version.
+4. Update templates to import the correct version.
+5. Do a final compilation/export check of all the templates.
+6. Ensure that tests pass.
+7. Ensure that the documentation manual builds.