DEV-2100: remove legacy docs-example snapshot

[demtario]

Summary

• delete the committed flat docs-examples snapshot

Blocked by

• DEV-2100: namespace docs-example buckets #59: bucket-scoped import generation
• DEV-2104: bucket-aware client loading and catalog tests

Do not merge until both prerequisites are integrated. This branch intentionally removes the manifest and artifacts that the current client and smoke test load.

Test plan

• Run after prerequisites merge and a bucketed snapshot is generated

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Note

Medium Risk
Large removal of static assets the authoring client may still depend on until bucketed import and loading ship; safe only when merged with the prerequisite PRs and a fresh snapshot.

Overview
Removes the committed legacy docs-examples snapshot under apps/authoring/public/docs-examples/: the old flat per-example JSON files (encoded paths like guides__…__example1.ts.json) that bundled full Sandpack/container catalog entries for docs guides.

That layout is superseded by bucket-scoped output (<bucket>/manifest.json plus lazy-loaded entry JSON), which this PR expects after #59 and DEV-2104 land. Do not merge until those prerequisites are in and a bucketed snapshot is regenerated, or the authoring app and smoke tests will have nothing to load.

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