Icons for GitHub Markdown Alerts

[okineadev]

I suggest adding icons for GitHub Markdown Alerts

Currently they look like this:

Alerts used on GitHub:

[mikouaji]

I have initial implementation ready but have 2 things I'd like to have others input on:

1. Is this icon selection ok, or should any of these be replaced?
   a. Note: i-carbon-information
   
   b. Tip: i-carbon-idea
   
   c. Important: i-carbon-information-square
   
   d. Warning: i-carbon-warning-alt
   
   e. Caution: i-carbon-warning
   
2. Should the alert headers be translated?
   a. If yes, I can get it working in the same PR.

[okineadev]

I have initial implementation ready but have 2 things I'd like to have others input on:

1. Is this icon selection ok, or should any of these be replaced?
   a. Note: i-carbon-information

I think Lucide icons would look better, but do as you wish

The info icon would look like this: (https://lucide.dev/icons/info)

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The icons seem to be placed too high or too low, they probably need to be aligned somehow

This can be clearly seen in the warning icon