fix(satori): fix impl about resource elements, fix #198, fix #217

[shigma]

• image -> img
• url -> src

[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (6390012) 86.08% compared to head (cf0ea11) 86.11%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
packages/element/src/index.ts	33.33%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #223      +/-   ##
==========================================
+ Coverage   86.08%   86.11%   +0.02%     
==========================================
  Files           1        1              
  Lines         503      504       +1     
  Branches      111      111              
==========================================
+ Hits          433      434       +1     
  Misses         70       70              

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