Update Indexer Documentation to include data-dir and catchpoint details

[algobarb]

Is your addition related to a problem? Please describe.
The "Install the indexer documentation" (docs/run-a-node/setup/indexer) are missing some details from the recent indexer releases (since 2.13.x) regarding the mandatory data-dir and how to use the --catchpoint flag.

Describe the solution you'd like
The "docs/run-a-node/setup/indexer" Run the Indexer section examples should match the ones in algorand/indexer repo: https://github.com/algorand/indexer#database-updater
Add missing --data-dir
We should also include some details on catchpoint: https://github.com/algorand/indexer/blob/2.13.0/docs/DataDirectory.md#initialization

Describe alternatives you've considered
I would reach out to Lamprey team and Product for wording.

Additional context
https://developer.algorand.org/docs/run-a-node/setup/indexer/
Data Directory details: https://github.com/algorand/indexer/blob/2.13.0/docs/DataDirectory.md#initialization
Indexer README examples: https://github.com/algorand/indexer#database-updater