docs: update Locker sharing and offline help

[megaberry]

Summary

• update Locker sharing docs to cover public links for both items and collections
• fix the sharing FAQ and overview pages so they no longer say collections can't be shared via public links
• update the offline FAQ to explain that locally kept items remain available without internet, with syncing and link actions still requiring connectivity

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update conflicting docs about collection public links

This change documents that collections can be shared via public links, but other Locker docs still state the opposite (for example docs/docs/locker/faq/sharing.md:33 and docs/docs/locker/index.md:55-56 say public links are item-only). After this commit, users can get contradictory guidance depending on which page they land on, so the new behavior appears unreliable or unavailable.

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[chatgpt-codex-connector]

Document how to delete collection public links

The page now includes steps to create collection public links, but the revocation section remains item-only (Long press on the item), which does not describe the collection flow. Users who share a collection link may not find how to disable it and could leave links active longer than intended.

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