Replace old background welcome

[SergioRibera]

• [x] Get number of members
• [x] Replace image
• [x] new lib to generate welcomes
• [x] Added fonts

[SergioRibera]

@Phosphorus-M @CrawKatt

[SergioRibera]

El psd de la imagen existe aqui https://github.com/RustLangES/arte-rustlang-es/tree/main/discord/Bievenidas asi que puede ser reemplazado sin problema en un futuro