feature: Add next and prev play buttons

[CodeAnk2829]

Actual Behaviour
Every time I complete a lecture, I either have to open the sidebar to choose the next one or go back to the content list page to select it.

Expected Behaviour
There should be "Next" and "Previous" buttons on the current page to easily navigate between lectures.

Steps to reproduce
See any lecture page: https://app.100xdevs.com/courses/3/385/387

[IkramBagban]

would love to work on this please assign

[AnubhavPurohit691]

can u assign me for this issue

[CodeAnk2829]

@IkramBagban and @AnubhavPurohit691 kindly contact maintainers.