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/services/index.md

@@ -0,0 +1,44 @@
+---
+title: Services
+description: >-
+  Custom web applications, system integration and long-term maintenance —
+  built by OnixByte to fit how your organisation already works.
+pageType: doc-wide
+sidebar: false
+outline: false
+footer: false
+head:
+  - - meta
+    - name: keywords
+      content: custom software development, bespoke web application, system integration, single sign-on, LDAP, legacy system maintenance, OnixByte
+sections:
+  - type: cta
+    id: contact
+    title: Tell Us What You Need Built
+    subtitle: Tell us about your project or your idea — we are around whenever you are ready.
+    actions:
+      - theme: brand
+        text: business@onixbyte.com
+        link: mailto:business@onixbyte.com
+    code:
+      src: /wechat-qr.png
+      caption: Or scan to reach us on WeCom
+---
+
+We build business systems, internal tools and integrations to fit the way your
+organisation already works — and then we keep them running. Most of our
+engagements turn into long relationships rather than one-off deliveries.
+
+## Where We Fit
+
+We are not the right choice for every project, and it saves everybody time to
+say so before we start.
+
+### A good fit
+
+- **The business logic is the hard part.** You need something shaped around how
+  you actually operate, not a template with your logo dropped into it.
+- **You have no in-house engineering team**, or the one you have is committed
+  elsewhere.
+- **You care what happens after launch.** We would rather maintain a system for
+  years than hand it over and disappear.