docs: consolidate datafusion-cli docs #6218
Merged
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Which issue does this PR close?
part of to #3058
Rationale for this change
I noticed the contents of https://github.com/apache/arrow-datafusion/tree/main/datafusion-cli#readme were partly redundant with https://arrow.apache.org/datafusion/user-guide/cli.html
Having one copy of the docs makes it more likely they will be kept up to date
What changes are included in this PR?
Consolidate content to doc site and leave link to doc site
Rendered datafusion-cli readme: https://github.com/alamb/arrow-datafusion/tree/alamb/consolidate_cli_readme/datafusion-cli
Are these changes tested?
Are there any user-facing changes?
better docs hopefully