Feat: Remove tokens for bin ops and is,isa

[JSAbrahams]

Summary

• Improve buildup in README
• Remove EoF token, no need underlying langauge takes care of detecting end of file
• Remove is and isa, introduces too many concepts into language at once
• Remove binary ops, introduces too many concepts in what is supposed to be more of a toy language
• Update docs to reflect these changes

Added Tests

• Existing test suite tests no regression

[codecov]

Codecov Report

❌ Patch coverage is 98.09524% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.37%. Comparing base (0e60a49) to head (f0b2646).

Files with missing lines	Patch %	Lines
src/parse/expression.rs	0.00%	1 Missing ⚠️
src/parse/operation.rs	90.90%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #488      +/-   ##
===========================================
+ Coverage    89.22%   89.37%   +0.15%     
===========================================
  Files          104      104              
  Lines        15253    14770     -483     
===========================================
- Hits         13609    13201     -408     
+ Misses        1644     1569      -75     

Files with missing lines	Coverage Δ
src/check/ast/mod.rs	100.00% <ø> (ø)
src/check/ast/node.rs	96.11% <ø> (+2.47%)	⬆️
src/check/constrain/generate/call.rs	89.96% <ø> (-0.29%)	⬇️
src/check/constrain/generate/mod.rs	93.93% <ø> (+1.18%)	⬆️
src/check/constrain/generate/operation.rs	88.03% <ø> (-0.44%)	⬇️
src/generate/ast/mod.rs	88.42% <ø> (+0.77%)	⬆️
src/generate/ast/node.rs	94.64% <ø> (-0.36%)	⬇️
src/generate/convert/mod.rs	93.87% <ø> (+1.06%)	⬆️
src/lib.rs	80.15% <100.00%> (ø)
src/parse/ast/mod.rs	85.29% <ø> (ø)
... and 12 more

... and 3 files with indirect coverage changes

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