Deprecate row/column labels

[yuce]

Overview

[Describe what this pull request addresses.]

Fixes #

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[jaffee]

docs/getting-started.md still references a custom column label. (line 60)

[yuce]

@jaffee updated

[jaffee]

It looks like the web UI still uses the labels feature - we should probably remove that to limit confusion.

[yuce]

Would it make sense to update webui in another PR?

[jaffee]

That's fine with me.