Refactor docs structure and add CLI option names

[tiangolo]

♻️ Refactor docs structure and add CLI option names.

This includes an update to typer.Argument()'s signature to remove the invalid param_decls.

[codecov-io]

Codecov Report

Merging #19 into master will increase coverage by 0.17%.
The diff coverage is 97.98%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   96.57%   96.75%   +0.17%     
==========================================
  Files          78       89      +11     
  Lines        1635     1817     +182     
==========================================
+ Hits         1579     1758     +179     
- Misses         56       59       +3

Impacted Files	Coverage Δ
docs/src/options/prompt/tutorial002.py	100% <ø> (ø)
docs/src/commands/arguments/tutorial001.py	100% <ø> (ø)
docs/src/options/prompt/tutorial001.py	100% <ø> (ø)
docs/src/options/help/tutorial002.py	100% <ø> (ø)
typer/params.py	100% <ø> (ø)	⬆️
docs/src/commands/name/tutorial001.py	100% <ø> (ø)
docs/src/commands/options/tutorial001.py	100% <ø> (ø)
docs/src/options/help/tutorial001.py	100% <ø> (ø)
docs/src/options/required/tutorial001.py	100% <ø> (ø)
docs/src/commands/index/tutorial002.py	100% <ø> (ø)
... and 41 more

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