add main font(inter) and system font in necessary use

[MahdiRahmany]

in src/app/layout.tsx just add main fonts

[mohammad-yg]

add main font with follow this page : https://nextjs.org/docs/pages/building-your-application/optimizing/fonts

also add other fonts and define fonts in tailwindCss config, follow this page : https://tailwindcss.com/docs/font-family