docs: improve SDK documentation and READMEs

[andrevmatos]

Fixes #

Short description

Definition of Done

• [ ] Steps to manually test the change have been documented
• [ ] Acceptance criteria are met
• [ ] Change has been manually tested by the reviewer (dApp)

Steps to manually test the change (dApp)

1. 2.

[codecov[bot]]

Codecov Report

Merging #3178 (d14b5de) into master (07af966) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3178   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files         213      213           
  Lines        8588     8588           
  Branches     1461     1461           
=======================================
  Hits         7989     7989           
  Misses        549      549           
  Partials       50       50           

Flag	Coverage Δ
dapp	88.97% <ø> (ø)
dapp.unit	88.97% <ø> (ø)
sdk	95.15% <ø> (ø)
sdk.e2e	72.05% <ø> (ø)
sdk.integration	80.29% <ø> (ø)
sdk.unit	49.32% <ø> (ø)

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