Deployed NFT bridges and support extra burn in gas oracle

[boyuan-chen]

• Support extra burn in gas oracle
• Deployed NFT bridges
• Update README

[codecov-commenter]

Codecov Report

Merging #242 (1d5c439) into develop (0b8a3f1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #242   +/-   ##
========================================
  Coverage    71.73%   71.73%           
========================================
  Files           68       68           
  Lines         2257     2257           
  Branches       335      335           
========================================
  Hits          1619     1619           
  Misses         638      638           

Flag	Coverage Δ
batch-submitter	59.59% <ø> (ø)
contracts	89.52% <ø> (ø)
core-utils	54.48% <ø> (ø)
data-transport-layer	37.68% <ø> (ø)
message-relayer	71.69% <ø> (ø)

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