Site: support switching between themes

[fahad19]

Browsers and versions affected

Self explanatory 😉

Description

Support switching between themes in deployed styleguide hosted at: https://travix-international.github.io/travix-ui-kit/#button

Describe thoroughly the issue.

Make sure to provide stack traces when you find errors. For that please provide it between ```...```

Steps to reproduce

Self explanatory.

The developer attempting to fix it will need these steps, otherwise will probably skip to other issues until their placed here or he finds out how to reproduce it (may take some time, so ease the process please).

Expected results

If any, please provide them.

In case of visual/presentational issues that can be fixed by downgrading the package's version, please provide screenshots of the old state.

Actual results

In case of visual/presentational issues, please provide screenshots of the current state.