Fix bug when export html, chart plotly not show

[quangduong109]

Because the DOM has not finished loading, the require plotly function fails, in fact the require function is an async function, so it cannot be assigned to the Plotly variable.
The fix is to replace the text in the returned plot function to pass the Plotly variable into the render chart function.
Before fix:

[chazkii]

Hi @quangduong109 thanks for the work and PR! Before we can merge, can you please:

• Remove all changes except the one in pybloqs/block/image.py - we will do a release ASAP with your doc fix
• Squash commits with new message "bugfix - get plotly export to html working with Block"

[quangduong109]

Hi @quangduong109 thanks for the work and PR! Before we can merge, can you please:

• Remove all changes except the one in pybloqs/block/image.py - we will do a release ASAP with your doc fix
• Squash commits with new message "bugfix - get plotly export to html working with Block"

I have updated. Please check and accept this pull request. Thank you ^^

[chazkii]

Hi @quangduong109, thanks, though you haven't squashed your commits - there should only be 1 commit to be merged. Though more importantly, I've just checked out your branch and plotly appears to still be broken, as seen when generating the docs via python setup.py build_sphinx. If you could please demonstrate how your change will fix an existing bug, then we can consider merging.