add/hide docs so all public items are documented

[ralexstokes]

fixes #76

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d72b6f9) 75.26% compared to head (39084be) 75.26%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   75.26%   75.26%           
=======================================
  Files          18       18           
  Lines         857      857           
=======================================
  Hits          645      645           
  Misses        212      212           

Impacted Files	Coverage Δ
ssz-rs/src/de.rs	80.00% <ø> (ø)
ssz-rs/src/merkleization/mod.rs	92.66% <ø> (ø)
ssz-rs/src/uint.rs	88.31% <ø> (ø)

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