[FEATURE] Improve A11y and enable Reader view

[saenyakorn]

Is your feature request related to a problem? Please describe.

Most modern browser has the feature called Reader View for visually impaired. For example, Medium or other web blog. To toggle Reader Viewer, you need to click paper-like icon near the browser search bar.

So, the Course Detail page, with many text and detail in its, should has more readability and should be improved accessibility for SEO purpose.

Describe the solution you'd like

Improve a11y and then enable reader view for Course Detail pages

Describe alternatives you've considered

Additional context

[bombnp]

So we're doing this for SEO purposes lmao