Make altering links on pages simpler

_includes/header.html

@@ -11,9 +11,8 @@
 <nav id="menu">
 	<ul class="links">
 		<li><a href="/" {% if page.url == "/" or page.url == "/index.html" %} class="current-page-link" {% endif %}>Home</a></li>
-		<li><a href="https://blog.mgrove.uk">Blog</a></li>
 
-		{% assign all_pages = site.pages | sort: "title" %}
+		{% assign all_pages = site.pages | concat: site.data.navigation | sort: "title" %}
 		{% for project in all_pages %}
 		{% assign project_url_end = project.url| slice: -4, 4 %}
 		{% if project.url != "/" and project.url != "/index.html" and project.url != "/sitemap.xml" and project_url_end != ".css" %}