docs(tutorial): Integrate a full tutorial

[epage]

This started with rust-bakery/nom#1525 and

• Updated for API improvements
• Tried to build on previous chapters to provide a more cohesive experience
• Integrated it into rustdoc

Fixes #101

[coveralls]

Pull Request Test Coverage Report for Build 4227314282

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.06%) to 52.401%

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Files with Coverage Reduction	New Missed Lines	%
src/bytes/complete.rs	1	76.97%
src/character/complete.rs	1	81.45%

Totals
Change from base Build 4225098223:	-0.06%
Covered Lines:	1735
Relevant Lines:	3311

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💛 - Coveralls

[tfpk]

Excited to see this being useful; let me know if there's any other changes I can help with (have been waiting for it to be merged into nom, but until then if I can help here I'd be happy to).

[epage]

Thank you for originally creating it!

I can't think of anything more at the moment. I did a pass to make the example build on itself and added the app integration at the end. At this point it is seeing where people get confused to see what could be made better.