Enable markdownlint no-duplicate-header (#27500)

Duplicate headers in a single Markdown document are problemlematic
because the auto-generated links won't be stable. Enable this rule with
no exceptions which is also the default of `markdownlint`. For example:

```md
# A
## Example
# B
## Example
```
Docasaurus will generated `example` and `example-1` links for this. If
the first heading is altered, the link `example` will unexpectedly move
to the second example heading.

Ref: https://github.com/go-gitea/gitea/pull/27461#discussion_r1347987659
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silverwind 2023-10-07 15:30:21 +02:00 committed by GitHub
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@ -50,7 +50,7 @@ a special meaning for your command shell.
If no pattern is provided, all files are listed.
### Example
### Example: Listing all embedded files
Listing all embedded files with `openid` in their path:
@ -101,7 +101,7 @@ When Gitea is upgraded to a new version (by replacing the executable), many of t
embedded files will suffer changes. Gitea will honor and use any files found
in the `custom` directory, even if they are old and incompatible.
### Example
### Example: Extracting mail templates
Extracting mail templates to a temporary directory: