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
+```