Added Settings Walkthrough and Mobile Settings Experience Improvements

[fingerthief]

Added a walkthrough guide of features for new users when opening the settings page for the first time.

Updated mobile settings experience to allow easy collapsing of the model selection panel along with other layout improvements for different screen sizes.

Updated application icon with higher resolution and slightly tweaked colors for the base.

Updated mobile model selections list styling and colors

Summary

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Contents (#133)

Uncategorised!

• Added Settings Walkthrough and Mobile Settings Experience Improvements
• allow closing of the walkthroughs

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit c5cffe2):

https://minimalgpt--pr133-dev-settings-walkthr-v21fecja.web.app

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