add publish-legacy instructions

Author: davidfirst

publish-legacy.md

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+Instructions to publish `@teambit/legacy` package.
+
+This is needed for backward compatibility. Some older components still have import statements from "@teambit/legacy/dist...". Whenever possible, remove them. Legacy has moved to components/aspects you can use directly.
+
+Steps to publish this package:
+
+1. run `git checkout publish-teambit-legacy`
+2. recommended: `git merge master`
+3. bump the version in the package.json file.
+4. run `npm publish` (make sure your local .npmrc doesn't have the @teambit registry temporarily for this command)
+5. commit and push the changes back to the remote.
+
+Once the package is published, update master with the new version in two places: in workspace.jsonc (inside the variants) and by running `bit deps set teambit.harmony/bit @teambit/[email protected]`.