docs(website): add documentation for taiki-e/install-action (#563)

* docs(website): add documentation for taiki-e/install-action

* style: simplify install-action docs

---------

Co-authored-by: Orhun Parmaksız <orhunparmaksiz@gmail.com>

website/docs/github-actions/taiki-e-install-action.md

@@ -0,0 +1,20 @@
+# taiki-e/install-action
+
+[taiki-e/install-action](https://github.com/taiki-e/install-action) enables a manual workflow
+where `git-cliff` is automatically installed into your GitHub Actions environment from pre-built releases
+and you can invoke it in subsequent shell script steps.
+
+For example:
+
+```yml
+- name: Check out repository
+  uses: actions/checkout@v3
+  with:
+    fetch-depth: 0
+
+- name: Install git-cliff
+  uses: taiki-e/install-action@git-cliff
+
+- name: Generate changelog
+  run: git-cliff
+```