feat(theme): add top placement for sections

- Add `placement: top|bottom` to the section frontmatter
- Override `DocContent` to render hoisted bands under the page title
- Derive the zebra stripe from list position so split bands stay continuous
- Opt marketing bands out of doc typography with `rp-not-doc`
- Point the legal and privacy contact address at legal@onixbyte.com
- Condense the products pages' body copy into their section frontmatter

docs/en-gb/legal/privacy.md

@@ -75,7 +75,7 @@ those rights are not affected by anything in this policy.
 
 Questions about this policy, or about how we handle data:
 
-**business@onixbyte.com**
+**legal@onixbyte.com**
 
 Changsha Onix Byte Technology Co., Ltd
 Hunan Province, China

docs/en-gb/legal/terms.md

@@ -81,7 +81,7 @@ that means you accept the revised terms.
 
 ## Contact
 
-**business@onixbyte.com**
+**legal@onixbyte.com**
 
 Changsha Onix Byte Technology Co., Ltd
 Hunan Province, China

docs/en-gb/products/index.md

@@ -40,22 +40,3 @@ sections:
 
 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)**