Add handler, page, template loading

pages/404-general.tmpl

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+{{define "head"}}<title>Page not found &mdash; {{.SiteName}}</title>{{end}}
+{{define "content"}}
+		<div class="error-page">
+			<p class="msg">This page is missing.</p>
+			<p>Are you sure it was ever here?</p>
+		</div>
+{{end}}

pages/404.tmpl

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+{{define "head"}}<title>Post not found &mdash; {{.SiteName}}</title>{{end}}
+{{define "content"}}
+		<div class="error-page" style="max-width:30em">
+			<p class="msg">Post not found.</p>
+			{{if and (not .SingleUser) .OpenRegistration}}
+			<p class="commentary" style="margin-top:2.5em">Why not share a thought of your own?</p>
+			<p><a href="/">Start a blog</a> and spread your ideas on <strong>{{.SiteName}}</strong>, a simple{{if .Federation}}, federated{{end}} blogging community.</p>
+			{{end}}
+		</div>
+{{end}}

pages/410.tmpl

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+{{define "head"}}<title>Unpublished &mdash; {{.SiteName}}</title>{{end}}
+{{define "content"}}
+		<div class="error-page">
+			<p class="msg">{{if .Content}}{{.Content}}{{else}}Post was unpublished by the author.{{end}}</p>
+			<p class="commentary">It might be back some day.</p>
+		</div>
+{{end}}

pages/500.tmpl

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+{{define "head"}}<title>Server error &mdash; {{.SiteName}}</title>{{end}}
+{{define "content"}}
+		<div class="error-page">
+			<p class="msg">Server error. &#x1F632; &#x1F635;</p>
+			<p>The humans have been alerted and reminded of their many shortcomings.</p>
+			<p style="margin-top:3em">On behalf of them, we apologize.</p>
+			<p>&ndash; The Write.as Bots</p>
+		</div>
+{{end}}

pages/blank.tmpl

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+{{define "head"}}<title>{{.Title}} &mdash; {{.SiteName}}</title>{{end}}
+{{define "content"}}<div class="content-container">{{.Content}}</div>{{end}}