chore: update upgrade button and resume button style

[saeedbashir]

Changing the color of the upgrade button to orange (button action color) and resume button style to secondary brand button as requested by Moiz.

https://2u-internal.atlassian.net/browse/LEARNER-10117

light mode	Dark Mode

[rnr]

@saeedbashir tests look broken. please look on this. thank you

[shafqat-muneer]

LGTM 👍

[marcotuts]

I don't think this is a change we expect to merge in upstream, the resume / start course buttons should remain primary and the upgrade button placement is specific to the edX build.

[saeedbashir]

I don't think this is a change we expect to merge in upstream, the resume / start course buttons should remain primary

@marcotuts I've made the resume button configurable in this PR #92. It will be primary for the openedX and edX(or any other provider) can configure it as per need.

and the upgrade button placement is specific to the edX build

At the moment, yes the placement is edX specific, we have the plan to push the payment-related generic code (UI, config, parsing, etc) upstream, so for that do you or Sam have any mockup available with upgrade button on the course home screen?