Revert "docs: add new-navigation-banner to discover-snyk classic pages (DOCT-2626 Phase B)"

[esabou-snyk]

Summary

Reverts #1579 (merged earlier today) which inserted the reusable new-navigation-banner include into 39 discover-snyk pages with nav_context: classic.

Why

The banner links to https://docs.snyk.io/getting-started/navigating-snyk, which currently returns 404 on live docs — the "Navigating Snyk" page for DOCT-2626 is still an unmerged GitBook draft (CR #28). Shipping the banner before the target lands sends users from real docs to a dead link.

Rolling back until sequencing is right:

1. Land the "Navigating Snyk" page on live docs.
2. Re-open the four Phase B rollout PRs (this one, plus docs: add new-navigation-banner to developer-tools classic pages (DOCT-2626 Phase B) #1580, docs: add new-navigation-banner to platform-administration classic pages (DOCT-2626 Phase B) #1581, docs: add new-navigation-banner to scan-fix-and-prevent classic pages (DOCT-2626 Phase B) #1582 which are still open and unmerged).

Phase A (#1577) is untouched — the include source files at <section>/.gitbook/includes/new-navigation-banner.md remain on main. They're inert without callers.

Test plan

• git diff main..revert/doct-2626-discover-snyk-rollout shows only removals of the {% include %} line across the same 39 discover-snyk files (+78/-0 in the original PR, now -78/+0 in this revert).
• After merge, docs.snyk.io/readme.md continues to show no banner (no visible change to end users, since the banner wasn't rendering yet or would have pointed at 404).
• Tracked in DOCT-2626.

---

Note

Low Risk
Documentation-only removal of a GitBook include; no product code or auth paths change.

Overview
This PR reverts the DOCT-2626 Phase B rollout on discover-snyk by deleting the {% include %} line for new-navigation-banner.md from 39 GitBook pages that use nav_context: classic (homepage, getting started, pilot guide, implementation guides, start scanning, Snyk Learn, and supported languages).

The banner pointed readers to Navigating Snyk at https://docs.snyk.io/getting-started/navigating-snyk, which is not live yet, so showing it would send users to a 404. Phase A include files under .gitbook/includes/ stay on main; they are unused until includes are added again after the target page ships.

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[snyk-io]

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