Adding Pages CMS (#952)

* Adding Pages CMS page and images.

* Add missing page for Pages CMS (I shouldn't send PRs before my first coffee)

src/site/headless-cms/pages-cms.md

@@ -0,0 +1,37 @@
+---
+title: Pages CMS
+repo: pages-cms/pages-cms
+homepage: https://pagescms.org/
+twitter: pagescms
+opensource: "Yes"
+typeofcms: "Git-based"
+supportedgenerators:
+  - All
+description: "Pages CMS is an Open Source CMS built on top of GitHub you can start using with a single click. It is ideal to manage static websites: Next.js, Astro, Nuxt, Hugo, Jekyll, 11ty, Zod, etc."
+images:
+  - path: /img/cms/pages-cms-1.png
+  - path: /img/cms/pages-cms-2.png
+  - path: /img/cms/pages-cms-3.png
+---
+
+# What is Pages CMS?
+
+[Pages CMS](https://pagescms.org/) is an [Open Source](https://github.com/pages-cms/pages-cms) Content Management System built for static websites and apps (Next.js, Astro, VuePress, Hugo, Nuxt, Jekyll, 11ty, etc).
+
+It allows you to edit your website's or app's content directly on GitHub via a user-friendly interface. 
+
+# Packed with features
+
+- **Nothing to install or deploy**: you can use Pages CMS entirely online without having to install or deploy anything.
+- **Full configurable**: configure content types, views, search, and more.
+- **Visual editor**: use WYSIWYG editors and interactive widgets to manage your content. 
+- **Full media management**: drag and drop images, upload multiple files at once, organize folders, etc.
+- **Full text search**: run fuzzy search on your content, filter by fields and term presence, etc.
+- **Works with all generators**: Hugo, Next.js, Nuxt, Astro, Jekyll, 11ty... As long as you're saving flat files, you can use Pages CMS.
+- **Supports all file formats**: YAML/JSON/TOML frontmatter, regular YAML/JSON/TOML, Markdown, HTML, Javascript, and more.
+- ...
+
+# How to use Pages CMS?
+
+- **[Use the online version (recommended) →](https://app.pagescms.org/)**
+- **[Install or deploy your own version →](https://pagescms.org/docs/development/)**