merge file structure with overview section

[natashamm]

From #626

I didn't change much of the content for now.

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📚 Documentation preview 📚: https://icalendar--739.org.readthedocs.build/

[coveralls]

Pull Request Test Coverage Report for Build 11937030576

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 38 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.2%) to 97.708%

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Files with Coverage Reduction	New Missed Lines	%
src/icalendar/timezone/init.py	1	85.71%
src/icalendar/tests/test_issue_662_component_properties.py	4	97.78%
src/icalendar/timezone/tzp.py	5	93.24%
src/icalendar/tests/conftest.py	5	95.63%
src/icalendar/cal.py	11	98.46%
src/icalendar/prop.py	12	97.88%

Totals
Change from base Build 11763222108:	0.2%
Covered Lines:	4130
Relevant Lines:	4224

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💛 - Coveralls

[stevepiercy]

Some syntax improvements, grammar fixes. Please spell out words, as it makes it easier to translate them.

[niccokunzmann]

I think, the docs pass the build. @natashamm , could you add a changelog entry? Let me know when you are done improving the docs! Thanks :)

[niccokunzmann]

Also, you can look here to see if it is how you like it: https://icalendar--739.org.readthedocs.build/en/739/usage.html

[natashamm]

@niccokunzmann it is ready to go if the line wrapping conversation can be resolved!

[stevepiercy]

I cleaned up all the code blocks to use the correct lexer, whether it was pycon or text according to its context.

[niccokunzmann]

Thanks @natashamm and @stevepiercy!