add newsletter example

exampleSite/config.default.yml

@@ -130,6 +130,9 @@ languages:
         - name: Docs
           url: /docs/
           weight: 1
+        - name: Newsletter
+          url: /newsletter/
+          weight: 1
         - name: Tags
           url: /tags/
           weight: 4

exampleSite/content/newsletter/001-hello-world/index.md

@@ -0,0 +1,7 @@
+---
+title: "My Newsletter: Hello World"
+date: 2022-09-07
+issueno: "001"
+---
+
+Welcome to PaperModX.

exampleSite/content/newsletter/_index.md

@@ -0,0 +1,13 @@
+---
+title: My Newsletter
+subtitle: What do you want to write?
+description: |
+  This is the template for creating a newsletter in PaperModX.
+type: newsletter
+cascade:
+  - _target:
+      kind: page
+    type: newsletter
+    titlePrefix: "My Newsletter: "
+    newsletterName: "My Newsletter"
+---

exampleSite/content/newsletter/archives.md

@@ -0,0 +1,5 @@
+---
+title: "My Newsletter Archives"
+layout: archives
+hidden: true
+---