Templates 2.0 (#636)

Templates 2.0 and a whole bunch of other refactoring

website/Library/Core/Page/Maintenance.md

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+We would like to keep our space clean, these are some tools that help you do that.
+
+# Broken links
+This shows all internal links that are broken.
+
+```template
+query: |
+  link where toPage and pageExists(toPage) = false
+template: |
+   {{#if .}}
+   {{#each .}}
+   * [[{{ref}}]]: broken link to [[{{toPage}}]]
+   {{/each}}
+   {{else}}
+   No broken links, all good!
+   {{/if}}
+```
+
+# Conflict copies
+These are pages that have conflicted copies (as a result of sync), have a look at them as well as their original (non-conflicted versions) and decide which one to keep.
+
+```template
+query: |
+  page where name =~ /\.conflicted\.\d+$/ 
+  select
+    name as conflictedName,
+    replace(name, /\.conflicted\.\d+$/, "") as cleanName
+template: |
+   {{#if .}}
+   {{#each .}}
+   * [[{{cleanName}}]]: confict copy [[{{conflictedName}}]]
+   {{/each}}
+   {{else}}
+   No conflicting pages!
+   {{/if}}
+```

website/Library/Core/Page/Template Index.md

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+This page lists all templates currently available in your space.
+
+# New Page
+$newPage
+These [[!silverbullet.md/Page Templates]] are available through the {[Page: From Template]} command.
+
+```query
+template where hooks.newPage render [[Library/Core/Query/Template]]
+```
+
+# Snippets
+$snippets
+These can be used as [[!silverbullet.md/Snippets]] via [[!silverbullet.md/Slash Commands]]:
+
+```query
+template where hooks.snippet render [[Library/Core/Query/Template]]
+```
+
+# Widgets
+$widgets
+Widgets can either be automatically attached to the top or bottom of pages (matching certain criteria) or used inline via [[!silverbullet.md/Live Templates]].
+
+## Top
+```query
+template
+where hooks.top
+order by order
+render [[Library/Core/Query/Template]]
+```
+
+## Bottom
+```query
+template
+where hooks.bottom
+order by order
+render [[Library/Core/Query/Template]]
+```
+
+## Inline
+Use these as `page` in [[!silverbullet.md/Live Templates]] to render useful things in your pages:
+
+```query
+template
+where name =~ /\/Widget\// and hooks.top = null and hooks.bottom = null
+order by order
+render [[Library/Core/Query/Template]]
+```