minor issues

[romanaduraciova]

• eosc colors
• sidebar hover and selected -- colors
• Alert - use --info token
• Badge - contrast between bg and badge-bg
• use a different color for e-infra --chart-6 token
• Checkbox - contrast of the checkbox against bg
• Switch - off state contrast
• e-infra dark mode: --chart-6 and --chart-1
• e-infra palette: Error button contrast in dark mode, Link button contrast in dark mode
• e-infra palette: sidebar button low contrast
• eosc font: Roboto, elter fonts: Montserrat, Helvetica Neue