feat: add app code

- journal domain package
- httpserver package
- html templates
- main.go in root dir

templates/entries.html

@@ -0,0 +1,29 @@
+{{ template "layout.html" . }}
+
+{{ define "title" }}Home{{ end }}
+
+{{ define "content" }}
+<style>
+  .disabled {
+    color: #aaa !important;
+    pointer-events: none;
+  }
+</style>
+<main class="container">
+  <h1>Journal entries</h1>
+  <hr />
+  <ul>
+    <!-- Entry title [date | YYYY-MM-DD] -->
+    {{ range .Entries }} <!-- begin range -->
+    <li>
+      <a href="/entry/{{ .ID }}">{{ .Title }}&nbsp[{{ .FormattedDate }}]</a>
+    </li>
+    {{ end }} <!-- end range -->
+  </ul>
+  <hr />
+  <p>
+    [<a href="/?offset={{ .Pagination.Prev }}" class="{{ if eq .Pagination.Prev 0 }}disabled{{ end }}">prev</a>]
+    [<a href="/?offset={{ .Pagination.Next }}" class="{{ if eq .Pagination.Next 0 }}disabled{{ end }}">next</a>]
+  </p>
+</main>
+{{ end }}