2024 Updates

[s2t2]

Updates:

• Simplifies spreadsheet model class interface, by abstracting the logic into, and using, the gspread_models package.
• Bumps version of the "google-auth" GitHub Action.
• Moves client side logic (the icon class and navbar color class definitions) into the bootstrap template HTML file.
• Allows page-specific customization of HTML <title> tag content, as desired.

FYI:

• Google OAuth no longer provides the user's "locale" (language)

Known Issues:

• Broken Profile Image #5

Next Steps:

• 2024 markdown updates #3