[Other]: Remove the colon sign in from of Callout titles

[amirhhashemi]

📋 Explain your issue

<Callout> titles currently have a colon in front of them by default (e.g., 'Info:', 'Tip:', etc.). I find the colons make the titles look ugly and inconsistent, as many users often forget to include them. This is evident in several instances throughout the documentation:

If you want to keep the colons, please hard-code them into the component. If you'd prefer to remove them, please remove them from the default titles too.

Feel free to assign this task to me if you’d like.

[LadyBluenotes]

Hi @amirhhashemi, you're more than welcomed to tackle this. Thank you!