git-cliff: add page (#15611)

* git-cliff: add page

* Apply suggestions from code review

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

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Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/git-cliff.md

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+# git cliff
+
+> A highly customizable changelog generator.
+> More information: <https://git-cliff.org/docs/usage/args>.
+
+- Generate a changelog from all commits in a Git repository and save it to `CHANGELOG.md`:
+
+`git cliff > {{CHANGELOG.md}}`
+
+- Generate a changelog from commits starting from the latest tag and print it to `stdout`:
+
+`git cliff {{-l|--latest}}`
+
+- Generate a changelog from commits that belong to the current tag (use `git checkout` on a tag before this):
+
+`git cliff --current`
+
+- Generate a changelog from commits that do not belong to a tag:
+
+`git cliff {{-u|--unreleased}}`
+
+- Write the default config file to `cliff.toml` in the current directory:
+
+`git cliff {{-i|--init}}`