consider removing jekyll example lesson

[maneesha]

Since we are archiving this lesson, we are removing it as an example here. Maybe should update here as well?
More about it in issue 490 on CLDT and aPR to fix it is drafted.

Originally posted by @sstevens2 in #397 (comment)

[maneesha]

From @tobyhodges - this will need to follow sunsetting of styles, so this should be done in 2026 Q1.