Remove the use of <div> in episode 01

[martinosorb]

This is apparently needed for the lesson to be workable with Crowdin for internationalisation purposes (see this thread on Slack).

Please note that I can't, at the moment, check whether the version in this PR will actually work in Crowdin -- but the problem there is supposed to be about the use of <div>.

What the PR does is to change the section on Markdown of the first episode to look like this:

Also fixes a typo by which the level-2 header looked the same as the level-1 header.

[github-actions]

Thank you!

Thank you for your pull request 😃

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Rendered Changes

🔍 Inspect the changes: https://github.com/swcarpentry/python-novice-gapminder/compare/md-outputs..md-outputs-PR-677

The following changes were observed in the rendered markdown documents:

 01-run-quit.md | 211 ++++++++++++++++-----------------------------------------
 md5sum.txt     |   2 +-
 2 files changed, 58 insertions(+), 155 deletions(-)

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⏱️ Updated at 2024-04-13 20:16:11 +0000

[alee]

thanks @martinosorb ! I'm going to close this PR since it's originating from your main branch which will cause problems down the line (i.e., extraneous merge commits) if merged but I've cherry picked the work into #678

[martinosorb]

Thank you so much for the quick response and for the extra work!