[APT-1931] Added new error pages (#734)

* [APT-1931] Added new error pages

These pages will be used for the checkout process. In case of customer errors - we will redirect to one of these two pages.

* Remove slug so that all the error page look correct

* Styling updates.

Author: eak12913

pages/charge-failed/index.html

@@ -0,0 +1,26 @@
+---
+layout: default
+title: Payment Incomplete
+excerpt: We were unable to create your subscription.
+permalink: /charge-failed/
+---
+
+<div class="main">
+  <div class="section section-hero">
+    <div class="container">
+      <div class="row">
+        <div class="col-xs-offset-2 col-xs-8 text-center">
+          <h1>{{ page.title }}</h1>
+          <p><b>{{ page.excerpt }}</b></p>
+          <p>
+            A member of the Gruntwork sales team will reach out soon to
+            coordinate payment and activate your subscription.
+          </p>
+          <a href="/" class="btn btn-info" role="button"
+            >Go to the Gruntwork home page</a
+          >
+        </div>
+      </div>
+    </div>
+  </div>
+</div>

pages/payment-incomplete/index.html

@@ -0,0 +1,32 @@
+---
+layout: default
+title: Payment Incomplete
+excerpt: We were unable to create your subscription.
+permalink: /payment-incomplete/
+---
+
+<div class="main">
+  <div class="section section-hero">
+    <div class="container">
+      <div class="row">
+        <div class="col-xs-offset-2 col-xs-8 text-center">
+          <h1>{{ page.title }}</h1>
+          <p><b>{{ page.excerpt }}</b></p>
+          <p>
+            Please ensure you've entered your payment information correctly, or
+            reach out to
+            <a href="mailto:[email protected]">[email protected]</a> if you
+            need assistance.
+          </p>
+          <a
+            href="#"
+            onclick="window.history.back()"
+            class="btn btn-info"
+            role="button"
+            >Back to checkout</a
+          >
+        </div>
+      </div>
+    </div>
+  </div>
+</div>