feat: generate the gt command reference from gitea/cli

update_cli_docs.sh runs gt's own generator and lays the pages out for the
site: one directory per command group, front matter, titles, sidebar
order, fenced help text and rewritten links. --released succeeds while no
series is documented. A weekly workflow proposes updates like the runner's.

Signed-off-by: bircni <[email protected]>

cli-docs/reference/pr/diff.md

@@ -0,0 +1,61 @@
+---
+sidebar_position: 8
+description: "Show the changes of a pull request"
+---
+
+# gt pr diff
+
+<!-- Generated by update_cli_docs.sh from the gitea/cli sources, do not edit. -->
+
+Show the changes of a pull request
+
+## Synopsis
+
+```text
+Show the changes of a pull request as a unified diff.
+
+On a terminal the diff is colored and paged. Piped, it is written unchanged, so that
+gt pr diff 13 | git apply works, and --name-only writes the exact file names.
+```
+
+```
+gt pr diff [<number> | <url> | <branch>] [flags]
+```
+
+## Examples
+
+```
+$ gt pr diff
+$ gt pr diff 13 --name-only
+$ gt pr diff 13 | git apply
+```
+
+## Options
+
+```
+      --color string   Color the diff {auto|always|never} (default "auto")
+  -h, --help           help for diff
+      --name-only      List only the names of the changed files
+  -w, --web            Open the changed files in the browser
+```
+
+## Options inherited from parent commands
+
+```
+      --cwd directory       Working directory for repository discovery
+      --debug               Log the method, URL, status, and duration of each HTTP request to stderr
+      --host URL            Gitea instance URL, including any base path
+      --interactive         Allow prompts with machine output
+  -q, --jq expression       Filter JSON output using a jq expression; implies --json
+      --json fields[="*"]   Output JSON with the specified comma-separated fields, or all fields
+      --no-input            Disable prompts and implicit editor/browser interactions
+      --remote remote       Git remote used for repository discovery
+  -R, --repo OWNER/REPO     Select a repository as OWNER/REPO or URL
+      --sudo user           Perform API requests as this user (requires an administrator account)
+      --user name           Account name on the selected instance
+  -y, --yes                 Accept confirmations without prompting
+```
+
+## SEE ALSO
+
+* [gt pr](../pr/index.md): Manage pull requests