Update Codebase

exemple with the set icon of the set "Fondation" (FDN)

Prerequisites

You need to have lessc and sass installed on your computer.

Open the sass/_variables.scss file in the repository.
Add the new set icon in the @keyrune-icons list. (You can see that i add the short code fdn and the unicode character 1f31f)
```
+ ("Foundations", "fdn", "\1f31f"),
```
Open the less/icons.less file in the repository.
Add the new set icon in the @keyrune-icons list. (You can see that i add the short code fdn and the unicode character 1f31f)
```
+ .@{ss-prefix}-fdn:before { content: "\1f31f"; } // Foundation
```

Yaay 🎉 you have update the codebase now everything is ready only one steps to use the new icon