add hire/resume pages, contact form, security middleware, and admin improvements

templates/error.html

@@ -0,0 +1,13 @@
+{{define "title"}}{{.Code}} {{.Title}} — Ridgway Systems{{end}}
+
+{{define "content"}}
+<div class="error-page">
+  <div class="error-code">{{.Code}}</div>
+  <h1>{{.Title}}</h1>
+  <p>{{.Message}}</p>
+  <a href="/" class="btn btn-outline">Go home</a>
+  {{if eq .Code 404}}
+  <a href="/blog" class="btn btn-outline">Build log</a>
+  {{end}}
+</div>
+{{end}}