Update Icon Usage to Standard Font Awesome Icons

[Sweetdevil144]

Decription

This Pull Request introduces changes to the icon usage within the Shiny dashboard application. The primary change is the update of custom or non-standard icon references to standard Font Awesome icons. Specifically, instances of the icon "square-C" have been replaced with the standard Font Awesome icon "square". This update ensures compatibility with the Font Awesome library and addresses issues related to non-recognizable icons.

By the end, this PR intends to fix #13.

Changes

• Replaced non-standard icon references (such as "square-C") with the standard Font Awesome icon "square".
• Applied this change in all instances where the non-standard icons were used, particularly within shinydashboard::menuSubItem.

Impact

• These changes should not affect the overall functionality of the application.
• Users should see the standard square icon from Font Awesome instead of the previously intended custom icon. Error logs should disappear too by the end of PR.

Note

• This PR is a part of ongoing debugging efforts. Although this update addresses specific icon-related issues, further investigation and fixes may be required to resolve other error logs as mentioned previously.
• Feedback and additional insights into the error logs are welcome to aid in comprehensive troubleshooting.

[Sweetdevil144]

@theakhiljha Can you help with debugging this if you find time to review these logs?