DOC-6435 polish initial use cases

[andy-stark-redis]

Note: several skeleton use case examples are in place but only the session store landing page and it's Python implementation are in the proposed final format. I'll get the other pages into shape when we're happy with the sample session store pages.

This provides some use case examples with runnable code demos for all the main client libraries. Some points to note:

• The landing page for the use case is based on the outline given in the Confluence page. However, checking this with LLMs suggested that the format needs tweaking a bit. However, if it's considered very important to stick to the template suggested in Confluence then I'll go back to that.
• There are no examples for hiredis (no real API) and ioredis (we don't recommend it for new projects) but I'll add those in if we think they would still be useful.
• The example code is deliberately minimal and uses Redis plus standard libraries only. If we want more examples of integrations with third party libraries then let me know.

All feedback is welcome, especially about the general integration of the code with the main use case info.

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Note

Low Risk
Docs-only updates that expand and restructure the session store use-case content; risk is limited to navigation/SEO and potential wording regressions.

Overview
Improves the use-cases docs IA and session-store narrative. The use-cases index now hides list links and simplifies the displayed list items, and the session-store landing page is rewritten/expanded with clearer sections (when to use, why it’s hard, expected outcomes, how Redis helps, ecosystem) plus a reorganized list of code examples.

Refines per-language session-store example pages and the Python example content. Example pages update frontmatter (notably linkTitle/titles and the .NET description) for consistent labeling. The redis-py session-store guide is enhanced to document TTL, describe reserved fields explicitly, and update examples to use WATCH/MULTI/EXEC for atomic TTL refresh, while adding documented helper operations like update_session, set_session_ttl, get_ttl, and delete_session.

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[github-actions]

DOC-6435

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/dotnet/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/go/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/java-jedis/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/java-lettuce/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/nodejs/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/php/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/redis-py/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/ruby/
https://redis.io/docs/staging/DOC-6435-polish-init-use-cases/develop/use-cases/session-store/rust/

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[dwdougherty]

LGTM.

[andy-stark-redis]

@dwdougherty Thanks for reviewing this (again!) Hopefully won't change too much more :-)