Reorder project and add book [1]

[edg-l]

• Removes the cargo workspace
• Adds a initial book template, with ci.
• Reorders the README features section, separating builtins from stdlib features

When merged i think the book will appear here https://lambdaclass.github.io/concrete/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.61%. Comparing base (5242889) to head (4c8997a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   54.61%   54.61%           
=======================================
  Files          22       22           
  Lines        5368     5368           
=======================================
  Hits         2932     2932           
  Misses       2436     2436           

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[github-actions]

Benchmarking factorial

Compiling factorial (factorial.con)
Finished release in 29.492613ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 62.24 ms
Rust Result = 2432902008176640000 Time taken : 62.23 ms

Benchmarking fib

Compiling fib (fib.con)
Finished release in 25.443485ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 136.62 ms
Rust Result = 6765 Time taken : 89.72 ms