Transfer all high-level docs to TuringTutorials

[yebai]

Companion PR of TuringLang/docs#375

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4d41959) 0.00% compared to head (d326ded) 0.00%.

❗ Current head d326ded differs from pull request most recent head 788b6e1. Consider uploading reports for the commit 788b6e1 to get more accurate results

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1933   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          22      21    -1     
  Lines        1452    1432   -20     
======================================
+ Misses       1452    1432   -20     

see 16 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 5707747434

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 5702124313:	0.0%
Covered Lines:	0
Relevant Lines:	1452

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💛 - Coveralls