docs: move templated files to a dedicated folder

.github/readme/partials/templated/templates.md

@@ -0,0 +1,7 @@
+## 🖼️ Templates
+
+Templates lets you change general appearance of rendered metrics.
+
+<% for (const [template, {name}] of Object.entries(templates).filter(([key, value]) => value)) { %>
+* [<%- name %> <sub>`<%= template %>`</sub>](/source/templates/<%= template %>/README.md)<%# -%>
+<% } %>