add docs for new models in data preprocessor

[quinnylee]

Adds instructions for preprocessing data for new community models (LSTM, rust LSTM, dhbv2.0 daily and hourly, SUMMA)
Adds links to those models

Closes CIROH-UA/NGIAB-CloudInfra#385

[github-actions]

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🔍 Inspect the changes: https://github.com/CIROH-UA/training-NGIAB-101/compare/md-outputs..md-outputs-PR-27

The following changes were observed in the rendered markdown documents:

 data-preparation.md | 40 +++++++++++++++++++++++++++++++++-------
 md5sum.txt          |  2 +-
 2 files changed, 34 insertions(+), 8 deletions(-)

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⏱️ Updated at 2026-02-24 17:41:13 +0000