Update docs release to v1.4.0

- Built changelog from towncrier fragments

[skip ci]

docs/changelog.d/+zk-docs-renamed-files.doc.md

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-Fixed zk-docs links after file renames due to relative path issues

docs/changelog.d/doc-exploring-the-docs-review.doc.md

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-Review exploring-the-docs tutorial: simplify wiki-links, fix broken replication/ reference, add Related section, match zk-docs flags to CLAUDE.md. Update use-pypi-proxy to document env-var-based proxy toggle.

docs/changelog.d/doc-exploring-the-docs-review.feature.md

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-Add documentation consistency checks: orphan detection in doc-links, new doc-index (category index coverage), doc-stale (staleness report), and doc-tags (tag inventory).

docs/changelog.d/doc-exploring-the-docs-review.infra.md

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-Add pre-commit to mise.toml project tools.

docs/changelog.d/feature-gandi-docs.doc.md

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-Add Gandi DNS reference card and operations how-to, rewrite homepage intro for wider audience.

docs/changelog.d/fix-doc-tags-and-changelog-types.doc.md

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-Add missing `ai` changelog fragment type to update-documentation guide, consolidate `cicd`→`ci-cd` and `network`→`networking` tags

docs/changelog.d/fix-homepage-admin-icons.bugfix.md

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-Fix broken icons for Pulumi and ArgoCD in homepage Admin bookmarks section.

docs/changelog.d/fix-restart-indri-docs.doc.md

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-Updated restart-indri how-to to reflect actual recovery procedure after power outage. Added UPS to indri specs.

docs/changelog.d/rename-doc-tasks.misc.md

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-Rename `doc-*` mise tasks to `docs-check-*` / `docs-review-*` for clearer naming convention.