CTX7-1846: Helm deployment docs page

[fahreddinozcan]

Adds the Helm deployment page for Context7 On-Premise, alongside the Helm chart PR (upstash/context7parser#574). Split out of the scaling docs PR so the chart and its docs ship together.

• Install (single container and multi-replica), ingress, migration Job, and a values reference.
• Adds the page to the Deployment nav group.

Note: the page links to /enterprise/deployment/scaling, which lands with the scaling docs PR (branch ctx7-1837-scaling-docs). Merge order: scaling docs first, then this. The docs.json nav array overlaps with that PR, so a trivial rebase may be needed depending on merge order.

[linear-code]

CTX7-1846

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[enesgules]

Nice page — matches the chart exactly (commands, service name, values table all check out). Three comments, only the first one matters:

1. The migration example's dataPvcName=context7-data will trip up people who installed with this chart. For them, the volume Kubernetes actually created is named data-<release>-context7-enterprise-0 (e.g. data-context7-context7-enterprise-0), not context7-data — that name only fits people coming from the raw Kubernetes guide. Worth adding a line like: "if you installed with the chart, find your volume with kubectl get pvc — it's named data-<release>-context7-enterprise-0."

2. Just confirming the scaling docs PR merges before this one, since this page links to /enterprise/deployment/scaling — otherwise those links 404 briefly. (Already flagged in the description.)

3. Tiny consistency nit: this page says the migration copies SQLite and the LanceDB index, while the chart README only mentions SQLite. This version seems to be the complete one — the chart README could be aligned in a follow-up.

[fahreddinozcan]

Addressed in 410d936:

1. Added a line to the migration step: find the PVC with kubectl get pvc -n context7; chart installs name it data-<release>-context7-enterprise-0, and context7-data matches the raw Kubernetes guide.
2. The scaling page is already on master (this branch just merged it in while resolving the nav conflict), so the links resolve.
3. Chart README aligned (SQLite + LanceDB index wording) in upstash/context7parser#637.