update models folder links

[Arhell]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues	resolve #302

[what-the-diff]

PR Summary

• Update Context.php Documentation Link
  The link in the 'Context.php' file used for referencing further reading material has been updated to reflect the latest destination.

• Update SideNavWidget.php Documentation Links
  Two links in the 'SideNavWidget.php' file, pointing to reference materials in the Bootstrap library, have been updated.

• Update style.css Comment Link
  The link in the 'style.css' file, used for researching the use of border-radius, has been updated to the most current version.

• Update Links in main.tex Comments
  Two links in the comments section of the 'main.tex' file, used as references in LaTeX typesetting, have been updated to the latest versions.

• Update Links in title.tex File
  In the 'title.tex' file, links leading to 'Yii Framework' documentation and terms of use have been updated to the HTTPS protocol for secure access.

• Remove Newline in title.tex
  The unnecessary newline character at the end of the 'title.tex' file has been removed. This helps keep our code cleaner and more efficient.