Feature/theme toggle

[danieldanielecki]

Fixes #68

• I have read and agree to the Code of Conduct, and have followed the Contributing guidelines.

Pull Request Type

• Bug fix (please link related issues if applicable)
• New feature
• Question update
• Other

Summary

The PR has mostly changes related to introducing theme toggle.

However, it also includes:

• Fixing [BUG] Error handling when application is crashing on root + general improvement of error handling #53 (general error page);
• 404 animation page;
• Card animations/changes;
• Footer gradient with particles animation;
• New Loading Indicator (Spinner);
• Fixing overflowed trial notification on mobile menu;
• Animation while selecting answers in Exam & Practice modes;
• Improved error handling;
• Removed Go To Home button in the login popup doing nothing when user's trial has expired;
• Other minor improvements.

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-plant-0e80e5803-80.westeurope.5.azurestaticapps.net

[danieldanielecki]

On this branch user has reported a bug: Ditectrev/Scrum-Master-I-PSM-I-Practice-Tests-Exams-Questions-Answers#21. Make sure to fix it before merging.

[danieldanielecki]

During debugging maybe also fix #53.

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-plant-0e80e5803-80.westeurope.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-plant-0e80e5803-80.westeurope.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-plant-0e80e5803-80.westeurope.5.azurestaticapps.net

[github-actions]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://kind-plant-0e80e5803-80.westeurope.5.azurestaticapps.net

[danieldanielecki]

looks good