Update shell support in docs

What is the problem?

Three documentation pages list supported shells in tables, but each page shows a different set of shells. A user gets a different answer depending on which page they land on.

Shell docs/shells/_index.md docs/configuration/advanced-configuration.md docs/executors/_index.md
bash
sh
powershell
pwsh
Windows Batch (deprecated)

Some shells appear on one or two pages but are missing from the others. This makes the documentation unreliable as a reference since no single page gives the complete picture.

#39379 (closed)

Edited by Pishel

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