docs: 📝 moved release.qmd contents into CHANGELOG.md (#161)

# Description

This moved the text out of the release doc into `CHANGELOG` to keep it
simpler. Plus added a sidebar to the landing page, rather than a menu
item on the navbar. More for aesthetic purposes and because it means
less clicking :P

This PR needs a quick review.

## Checklist

- [x] Ran `just run-all`

Author: lwjohnst86

CHANGELOG.md

@@ -1,3 +1,15 @@
+# Changelog
+
+Since we follow [Conventional
+Commits](https://decisions.seedcase-project.org/why-conventional-commits),
+we're able to automatically create a release based on the commit message
+by using
+[Commitizen](https://decisions.seedcase-project.org/why-semantic-release-with-commitizen).
+This means that releases can happen quite often, sometimes several in
+a day. It also means any individual release will not have many changes
+within it. Below is a list of releases along with what was changed
+within it.
+
 ## 0.16.0 (2025-08-26)
 
 ### Feat

_quarto.yml

@@ -3,10 +3,8 @@ project:
   render:
     # Don't render anything in the template directory.
     - "!template/"
-    - "docs/"
-    - "index.qmd"
-    - "404.qmd"
-    - "CONTRIBUTING.md"
+    - "*.qmd"
+    - "*.md"
 
 website:
   title: "Template Python Package"
@@ -19,13 +17,7 @@ website:
     pinned: true
     left:
       - text: "Overview"
-        menu:
-          - text: "Welcome"
-            href: index.qmd
-          - text: "Releases"
-            href: docs/releases.qmd
-          - text: "Contributing"
-            href: CONTRIBUTING.md
+        href: index.qmd
       - text: "Guide"
         href: docs/guide.qmd
     tools:
@@ -35,6 +27,15 @@ website:
       - icon: house
         href: https://seedcase-project.org
         aria-label: "House icon: Seedcase Project home page"
+  sidebar:
+    - id: overview
+      pinned: true
+      style: "floating"
+      contents:
+        - text: "Welcome"
+          href: index.qmd
+        - CHANGELOG.md
+        - CONTRIBUTING.md
 
 format:
   seedcase-theme-html:
@@ -47,6 +48,3 @@ editor:
   markdown:
     wrap: 72
     canonical: true
-
-execute:
-  echo: false