migrate view helper components into core components

lib/memex_web/components/core_components/date.html.heex

@@ -0,0 +1,7 @@
+<time :if={@date} datetime={@date |> Date.to_iso8601(:extended)} x-data={~s<{
+    date:
+      Intl.DateTimeFormat([], {timeZone: 'Etc/UTC', dateStyle: 'short'})
+        .format(new Date("#{Date.to_iso8601(@date, :extended)}"))
+  }>} x-text="date">
+  <%= @date |> Date.to_iso8601(:extended) %>
+</time>

lib/memex_web/components/core_components/datetime.html.heex

@@ -0,0 +1,7 @@
+<time :if={@datetime} datetime={cast_datetime(@datetime)} x-data={~s/{
+    datetime:
+      Intl.DateTimeFormat([], {dateStyle: 'short', timeStyle: 'long'})
+        .format(new Date("#{cast_datetime(@datetime)}"))
+  }/} x-text="datetime">
+  <%= cast_datetime(@datetime) %>
+</time>

lib/memex_web/components/core_components/qr_code.html.heex

@@ -0,0 +1,3 @@
+<a href={qr_code_image(@content)} download={@filename <> ".png"}>
+  <img class={@image_class} alt={@filename} src={qr_code_image(@content)} />
+</a>