refactor: prefine for version v1.0.2 (#269)

* refactor: refactor navigateVector logic and remove unused functions

* refactor: refactor HTML structure and styling in single.html

- Modify the `.info` class to `article` in `_article.scss`
- Remove the `nav.html` partial in `single.html`
- Change the class name from `info` to `article` in `single.html`
- Add the `nav.html` partial in `single.html`

* refactor: update handling of 404 page
- Now hugo will set unknown page title as "404"
- Add condition to return an empty image array if the document title starts with "404"

* docs: update documentation

layouts/_default/single.html

@@ -6,11 +6,12 @@
     data-close="{{- i18n "close" -}}"
     data-loading="{{- i18n "loading" -}}"
   >
-    {{- partial "nav.html" . -}}
     {{- with .Content -}}
-      <article class="info">
+      <article>
         {{- . -}}
       </article>
     {{- end -}}
+
+    {{- partial "nav.html" . -}}
   </div>
 {{- end -}}