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docs: template variables (#26547)

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Explanation for using gitea's variables in `.tmpl` files.

Thanks to @wxiaoguang for advising me on
[discord](https://discord.com/channels/322538954119184384/561007778139734027/1141217820441587722).
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docs/content/administration/customizing-gitea.en-us.md
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@ -126,7 +126,17 @@ Apart from `extra_links.tmpl` and `extra_tabs.tmpl`, there are other useful temp
- `body_outer_post.tmpl`, before the bottom `<footer>` element.
- `footer.tmpl`, right before the end of the `<body>` tag, a good place for additional JavaScript.
#### Example: PlantUML
### Using Gitea variables
It's possible to use various Gitea variables in your custom templates.
First, _temporarily_ enable development mode: in your `app.ini` change from `RUN_MODE = prod` to `RUN_MODE = dev`. Then add `{{ $ | DumpVar }}` to any of your templates, restart Gitea and refresh that page; that will dump all available variables.
Find the data that you need, and use the corresponding variable; for example, if you need the name of the repository then you'd use `{{.Repository.Name}}`.
If you need to transform that data somehow, and aren't familiar with Go, an easy workaround is to add the data to the DOM and add a small JavaScript script block to manipulate the data.
### Example: PlantUML
You can add [PlantUML](https://plantuml.com/) support to Gitea's markdown by using a PlantUML server.
The data is encoded and sent to the PlantUML server which generates the picture. There is an online
@ -162,7 +172,7 @@ Alice <-- Bob: Another authentication Response
The script will detect tags with `class="language-plantuml"`, but you can change this by providing a second argument to `parsePlantumlCodeBlocks`.
#### Example: STL Preview
### Example: STL Preview
You can display STL file directly in Gitea by adding: