docs: translate gitlab-ops to en-gb, enhance gravatar article, fix heading levels

- Translate GitLab Operations article from Chinese to British English
- Add comprehensive Gravatar usage guide with code examples in both locales
- Fix heading levels on notification pages (h1 -> h2)
- Enable line numbers in code blocks via rspress config

docs/en-gb/blog/contents/gitlab-ops.md

@@ -0,0 +1,50 @@
+---
+title: GitLab Operations
+---
+
+## Setting the Default Language to Chinese in GitLab
+
+GitLab filters out languages with less than 90% translation coverage via the `SWITCHER_MINIMUM_TRANSLATION_LEVEL` variable in the code. Simplified Chinese sits at 84% and Traditional Chinese at 83%.
+
+Navigate to `/path/to/gitlab/embedded/service/gitlab-rails/app/helpers/preferred_language_switcher_helper.rb` and modify the code as follows:
+
+```diff title="/path/to/gitlab/embedded/service/gitlab-rails/app/helpers/preferred_language_switcher_helper.rb" 
+- SWITCHER_MINIMUM_TRANSLATION_LEVEL = 90
++ SWITCHER_MINIMUM_TRANSLATION_LEVEL = 80
+```
+
+Then restart GitLab with `gitlab-ctl restart`.
+
+## Adding ICP Filing Information to the Homepage
+
+Navigate to `/path/to/gitlab/embedded/service/gitlab-rails/app/views/devise/shared/_footer.html.haml` and add the following:
+
+```diff
++ = link_to _("Your ICP Filing Number"), "https://beian.miit.gov.cn/", target: '_blank', class: 'text-nowrap', rel: 'noopener noreferrer'
+```
+
+## Upgrading GitLab
+
+### Downloading the GitLab CE Package
+
+Download the deb package from the [GitLab Package page](https://packages.gitlab.com/gitlab/gitlab-ce) and transfer it to the server using `scp` or a similar tool.
+
+### Stopping Memory-Intensive Services
+
+```shell
+gitlab-ctl stop puma
+gitlab-ctl stop sidekiq
+```
+
+### Running a Backup
+
+```shell
+# Example: skip build artefacts and container registry, backing up only the database and repositories
+sudo gitlab-backup create SKIP=artifacts,registry
+```
+
+### Installing
+
+```shell
+sudo dpkg -i gitlab-package.deb
+```

docs/en-gb/blog/contents/use-of-gravatar.md

@@ -2,4 +2,78 @@
 title: Use Gravatar in First-party Systems
 ---
 
-Insert a `<img src="https://gravatar.com/avatar/$SHA256(email)/?d=identicon">`.
+[Gravatar](https://gravatar.com) (Globally Recognised Avatar) is a service that associates avatar images with email
+addresses. When a user registers on your platform with their email, you can display their Gravatar as a default avatar
+without building your own image upload and storage pipeline.
+
+## How It Works
+
+Gravatar exposes a simple HTTP endpoint. You compute the SHA256 hash of the user's **lowercased and trimmed** email
+address, then embed it in an image URL:
+
+```
+https://gravatar.com/avatar/<hash>
+```
+
+## Generating the Hash
+
+### Node.js
+
+```js
+import { createHash } from "node:crypto";
+
+const email = "user@example.com".trim().toLowerCase();
+const hash = createHash("sha256").update(email).digest("hex");
+const url = `https://gravatar.com/avatar/${hash}`;
+```
+
+### Python
+
+```python
+import hashlib
+
+email = "user@example.com".strip().lower()
+hash = hashlib.sha256(email.encode()).hexdigest()
+url = f"https://gravatar.com/avatar/{hash}"
+```
+
+### Shell
+
+```shell
+echo -n "user@example.com" | tr '[:upper:]' '[:lower:]' | sha256sum | cut -d ' ' -f1
+```
+
+## URL Parameters
+
+The `/avatar/` endpoint accepts several query parameters to customise the result:
+
+| Parameter | Description                             | Example        |
+|-----------|-----------------------------------------|----------------|
+| `s`       | Size in pixels (default: 80)            | `?s=200`       |
+| `d`       | Default image when no Gravatar is found | `?d=identicon` |
+| `r`       | Content rating (`g`, `pg`, `r`, `x`)    | `?r=g`         |
+
+### Default Image Options (`d`)
+
+- `identicon` — a geometric pattern based on the hash
+- `robohash` — a generated robot image
+- `retro` — an 8-bit style pixelated face
+- `monsterid` — a generated monster cartoon
+- `wavatar` — a generated face
+- `mp` — a generic silhouette (Mystery Person)
+- `blank` — a transparent PNG
+- A custom URL (must be URL-encoded)
+
+### Putting It Together
+
+```html
+<img
+  src="https://gravatar.com/avatar/a3b4c5d6e7f8?s=160&d=robohash&r=g"
+  alt="User avatar"
+  width="160"
+  height="160"
+/>
+```
+
+Always pass the `d` parameter to avoid broken images for users who have not set up a Gravatar. `identicon` and
+`robohash` are popular choices because they generate a unique, recognisable image for every hash.