Use consistent indentation throughout html files

[msulprizio]

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Name: Melissa Sulprizio Institution: Harvard / GCST

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In pull request https://github.com/geoschem/geoschem.github.io/pull/10, @lizziel pointed out the inconsistent indentation used in people.html. This is also the case for a few of the other html files. This is mainly caused by editors such as emacs imposing automatic indentation when adding new spaces or lines.

To fix this @yantosca wrote:

There are some online tools that might help, such as: https://www.freeformatter.com/html-formatter.html

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