Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

website/Library/Core/Widget/Linked Mentions.md

@@ -0,0 +1,18 @@
+---
+description: Adds Linked Mentions to pages
+tags: template
+hooks.bottom.where: 'true'
+---
+```template
+# We need to escape handlebars directives here, since we're embedding
+# this template into a template (INCEPTION)
+template: |
+  {{escape "#if ."}}
+  # Linked Mentions
+  {{escape "#each ."}}
+  * [[{{escape "ref"}}]]: `{{escape "snippet"}}`
+  {{escape "/each"}}
+  {{escape "/if"}}
+query: |
+  link where toPage = "{{@page.name}}" and page != "{{@page.name}}"
+```