first draft of exercise 2
Merge branch 'me134a#exercise-2'
Merge branch 'me105a'
cont. L02, added CSS for infoboxes
Merge branch 'me134a#exercise-2'
continued.
merge
merge
merge
merge
merge
merge
Update lecture2.md
Update lecture2.md
Update lecture2.md
Update lecture2.md
Update lecture2.md
Update lecture2.md
conflict
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