Make mkdocs documentation for powerfit

[AnnaEngel98]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 0.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (047844f)	1975	519	26.28%
Head commit (bf998b2)	1975 (+0)	519 (+0)	26.28% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#102)	1	0	0.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[AnnaEngel98]

Documentation for Powerfit using mkdocs finished. Only thing remaining is cli.md using mkdocs-rich-argparse which depends on i-VRESSE/mkdocs_rich_argparse#6

[sverhoeven]

Great work.

I have some suggestions on how to chop up the README.

[sverhoeven]

Looks good.

Just one correction rendering screenshot on https://pypi.org/project/powerfit-em/