[bug]: theme files not bundled

[Gokul Suresh]

Issue

Currently, the CSS file imported does not contain the design tokens such as color, themes, etc. As per Hoppscotch-common, we have accent-themes, base-themes, editor-themes, etc which sets up CSS variables that the components use. which should be included in the package bundle.

There is a theme.scss exported in package.json but it is missing from the bundle.