vega: Remove plot_ prefix.

[daavoo]

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[codecov-commenter]

Codecov Report

Merging #64 (7de079d) into main (5bfd273) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   97.16%   97.14%   -0.02%     
==========================================
  Files          16       16              
  Lines         493      491       -2     
  Branches       78       77       -1     
==========================================
- Hits          479      477       -2     
  Misses          8        8              
  Partials        6        6              

Impacted Files	Coverage Δ
src/dvc_render/vega.py	100.00% <ø> (ø)

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[pared]

Related to #61. We are removing the plot_ prefix from Renderer name. TableRenderer will not create plot, and there was never an actual reason to prefix the name like that.