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)**

docs/zh-hans/legal/privacy.md

@@ -56,7 +56,7 @@ localStorage 键），但未经律师审阅。正式依赖前请交由法务检
 
 关于本政策，或关于我们如何处理数据：
 
-**business@onixbyte.com**
+**legal@onixbyte.com**
 
 长沙曜珀科技有限公司
 中国湖南省

docs/zh-hans/legal/terms.md

@@ -57,7 +57,7 @@ OnixByte 名称、标识及本网站的设计归我们所有。我们发布的
 
 ## 联系方式
 
-**business@onixbyte.com**
+**legal@onixbyte.com**
 
 长沙曜珀科技有限公司
 中国湖南省

docs/zh-hans/products/index.md

@@ -37,17 +37,3 @@ sections:
 ---
 
 除了客户项目，我们也做自己的工具。数量刻意保持得很少：每一件都是因为我们自己需要，并且认为别人可能也需要。
-
-## 免费使用，无需安装
-
-这里的每一个工具都完全在您的浏览器中运行。不需要注册账号，也没有任何上传步骤 —— 您粘贴进去的内容始终留在您自己的机器上。
-
-这是刻意为之，不是能力所限。我们自己在真实的配置文件和真实的接口返回上使用这些工具，而一个会把数据传出去的工具，我们自己就不会用。
-
-## Dev Lab
-
-为「大到没法用肉眼看」的嵌套 JSON 而做的查看器。粘贴一段返回数据，用 JSONPath 查询，命中的字段会就地高亮，结果可一键复制。
-
-除此之外，它还带了一些我们日常反复需要的小工具。
-
-**[打开 Dev Lab →](https://dev-lab.onixbyte.com)**