docs: update jcloud gpu usage

[ZiniuYu]

Add instructions on using GPU in Jcloud

[codecov]

Codecov Report

Merging #809 (13b229d) into main (3c43eed) will decrease coverage by 2.45%.
The diff coverage is n/a.

❗ Current head 13b229d differs from pull request most recent head 51087d2. Consider uploading reports for the commit 51087d2 to get more accurate results

@@            Coverage Diff             @@
##             main     #809      +/-   ##
==========================================
- Coverage   84.10%   81.65%   -2.46%     
==========================================
  Files          21       21              
  Lines        1466     1466              
==========================================
- Hits         1233     1197      -36     
- Misses        233      269      +36     

Flag	Coverage Δ
cas	81.65% <ø> (-2.46%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/clip_server/executors/clip_onnx.py	81.15% <ø> (-2.90%)	⬇️
server/clip_server/executors/clip_tensorrt.py	92.72% <ø> (ø)
server/clip_server/executors/clip_torch.py	85.71% <ø> (+3.17%)	⬆️
server/clip_server/model/trt_utils.py	56.04% <0.00%> (-27.48%)	⬇️
server/clip_server/model/clip_trt.py	69.38% <0.00%> (-16.33%)	⬇️
server/clip_server/model/clip_onnx.py	82.22% <0.00%> (-6.67%)	⬇️

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[github-actions]

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