docs: update copyright and remove label field from user guide

docs/user_guide/structure_of_the_yaml_input_file.md

@@ -47,7 +47,6 @@ The `cv` field of the YAML input starts with generic information, as shown below
 ```yaml
 cv:
   name: John Doe
-  label: Mechanical Engineer
   location: Your Location
   email: youremail@yourdomain.com
   phone: +905419999999

mkdocs.yaml

@@ -1,7 +1,7 @@
 site_name: RenderCV
 site_description: LaTeX CV generator engine from a YAML input file.
 site_author: Sina Atalay
-copyright: Copyright © 2023 Sina Atalay
+copyright: Copyright © 2023 - 2024 Sina Atalay
 site_url: https://docs.rendercv.com
 repo_url: https://github.com/sinaatalay/rendercv
 repo_name: sinaatalay/rendercv
@@ -111,11 +111,11 @@ plugins:
 
 extra_javascript:
   - assets/javascripts/katex.js
-  - https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.16.9/katex.min.js
-  - https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.16.9/contrib/auto-render.min.js
+  - https://unpkg.com/katex@0/dist/katex.min.js
+  - https://unpkg.com/katex@0/dist/contrib/auto-render.min.js
 
 extra_css:
-  - https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.16.9/katex.min.css
+  - https://unpkg.com/katex@0/dist/katex.min.css
 
 extra:
   analytics: