Traffic policies: split policy Actions and Selectors into subpages

[mahathi-hariharan]

Summary

Splits the DNS, Network, and HTTP policy index pages into an overview (with a
policy-composition example shown as both a human-readable table and the equivalent
wire-filter expression) plus dedicated actions.mdx and selectors.mdx pages —
so each building block of a policy is its own page.

Notes

• Builds on group policy types under policy-types #32051 + Traffic policies: reference pages, TLS decryption section, Send traffic to Gateway #32053
• All inbound and intra-page anchor links migrated to the new actions/ and
  selectors/ subpages. No redirects needed (the index URLs are unchanged).
• No page content rewritten — the Actions/Selectors sections are moved verbatim.

[cloudflare-docs-bot]

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