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/partials/function/currentMenuItem.html

@@ -1,7 +1,7 @@
 {{- $currentPage := . -}}
 
 {{- $identifier := "" -}}
-{{- $title := "" -}}
+{{- $title := "404" -}}
 {{- $weight := -1 -}}
 
 {{- range site.Menus.main -}}