docs: move templated files to a dedicated folder

.github/readme/partials/templated/documentation.md

@@ -0,0 +1,9 @@
+# 📚 Documentation
+
+<% if (/[.]0-beta$/.test(packaged.version)) { %>
+> <sup>*⚠️ This is the documentation of **v<%= packaged.version.replace(/[.]0-beta$/, "") %>-beta** (`@master`/`@main` branches) which includes [unreleased features](https://github.com/lowlighter/metrics/compare/latest...master). See documentation for [**v<%= (Number(packaged.version.replace(/[.]0-beta$/, ""))-0.01).toFixed(2).replace(/[.]0/, ".") %>** (`@latest` branch) here](https://github.com/lowlighter/metrics/blob/latest/README.md).*</sup>
+<% } %>
+
+<% for (const partial of ["documentation/setup", "templated/templates", "templated/plugins", "documentation/contributing"]) { %>
+<%- await include(`/partials/${partial}.md`) -%>
+<% } %>