feat: UI changes from configuration

[Shruti3004]

Description

Adding a Spec-driven UI changes. Currently, for any instance we have to replace all the primary, secondary and tertiary colours values in the code. Instead it should be the part of config. The config can look like:

{
    "primaryColor": "#F34621",
    "secondaryColor": "#F34621"
    "backgroundColor": "#F34621"
    "fontFamily": "#F34621"
}