[Docs] Fix outdated docs

[hanouticelina]

this PR fixes a bunch of outdated docs.

also closes #4052.

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Note

Low Risk
Documentation-only changes plus a docstring tweak in _http.py; no runtime behavior changes expected.

Overview
Updates multiple docs to match current APIs/CLI behavior: hf repos tag now uses list/ls and delete subcommands, repository creation docs prefer visibility="private", and delete_repo(..., missing_ok=True) is documented.

Refreshes other guidance and references: clarifies opting into no-symlink caching via HF_HUB_DISABLE_SYMLINKS, switches webhook server examples from run() to launch(), corrects HTTP examples to httpx/get_session(), removes HUGGINGFACE_HUB_VERBOSITY from deprecated env-var tables (EN+KO), and fixes the inference providers support table formatting/entries.

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[bot-ci-comment]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[Wauplin]

Some things are good but others really feel like sloppy content (or out of context for a "fix outdated docs" PR)