Revert "Add maintenance page using custom error code"

This reverts commit 37c08ce5ee.

package.json

@@ -1,6 +1,6 @@
 {
     "name": "error-pages",
-    "version": "1.3.2",
+    "version": "1.3.1",
     "description": "Error pages for my website.",
     "author": "Felix W. Dekker",
     "browser": "dist/bundle.js",

src/main/_data/error-pages.json

@@ -98,10 +98,5 @@
     {
         "name": "HTTP version not supported",
         "code": "505"
-    },
-    {
-        "name": "Maintenance",
-        "code": "590",
-        "maintenance": "true"
     }
 ]

src/main/template.njk

@@ -37,13 +37,9 @@ permalink: "{{ errorPage.code | slug }}.html"
     <div id="nav"></div>
     <div id="contents">
         <section class="container">
-            <h3>{{ errorPage.name }}{% if not errorPage.maintenance %} <small>({{ errorPage.code }})</small>{% endif %}</h3>
+            <h3>{{ errorPage.name }} <small>({{ errorPage.code }})</small></h3>
             Sorry for the inconvenience.
-            {% if errorPage.maintenance %}
-                Please try again in a minute or so.
-            {% else %}
-                You may want to try going to <a href="https://fwdekker.com/">this website's homepage</a>.
-            {% endif %}
+            You may want to try going to <a href="https://fwdekker.com/">this website's homepage</a>.
         </section>
     </div>
     <div id="footer"></div>