feat(content): add products, services and legal pages

- Add /products/, covering the one product actually in service. It is
  written to match reality rather than padded out to look like a matrix.
- Add /services/, describing the work taken on and, deliberately, the
  work that is not a good fit.
- Add the privacy policy and terms, linked from the footer. Both describe
  what the site actually does — no cookies, no analytics — and carry
  TODO notes for the parts needing legal review.

docs/en-gb/products/index.md

@@ -0,0 +1,61 @@
+---
+title: Products
+description: >-
+  Dev Lab — a set of free developer utilities from OnixByte that run entirely
+  in your browser.
+pageType: doc-wide
+sidebar: false
+outline: false
+footer: false
+head:
+  - - meta
+    - name: keywords
+      content: Dev Lab, JSON viewer, JSONPath, developer tools, browser-based, privacy, OnixByte
+sections:
+  - type: contentGrid
+    id: products
+    title: What We Run
+    subtitle: Small in number, and used by us daily.
+    items:
+      - icon: "🧰"
+        title: Dev Lab
+        details: A collection of developer utilities, led by a JSON viewer with JSONPath queries. Everything runs locally in your browser, so nothing you paste in is ever uploaded.
+        link: https://dev-lab.onixbyte.com
+        span: 6
+  - type: cta
+    id: contact
+    title: Need Something Like This Built for You?
+    subtitle: Tell us about your project or your idea — we are around whenever you are ready.
+    actions:
+      - theme: brand
+        text: See What We Do
+        link: /services/
+      - theme: alt
+        text: business@onixbyte.com
+        link: mailto:business@onixbyte.com
+    code:
+      src: /wechat-qr.png
+      caption: Or scan to reach us on WeCom
+---
+
+Alongside client work we build tools of our own. We keep the number small: each
+one exists because we needed it ourselves and suspected others did too.
+
+## Free to use, nothing to install
+
+Every tool here runs entirely in your browser. There is no account to create and
+no upload step — whatever you paste in stays on your machine.
+
+That is a deliberate choice rather than a limitation. We use these tools on real
+configuration files and real API responses, and a tool that phones home is a
+tool we would not be able to use.
+
+## Dev Lab
+
+A JSON viewer built for data that is too large and too nested to read by hand.
+Paste a response, query it with JSONPath, and the matching fields are
+highlighted in place. Matches can be copied out in one click.
+
+It also carries a few smaller utilities we kept reaching for.
+
+**[Open Dev Lab →](https://dev-lab.onixbyte.com)**