[explorer] Fix smart contract rendering

[666lcz]

Before:
There will be an error for rendering Move package object(example: https://explorer-internal-testing.s3-website-us-east-1.amazonaws.com/objects/8070E826B3668A048A59A095DE23EC26491CA2D9)

After:

[apburnie]

@666lcz - We have a PR that covers this here: https://github.com/MystenLabs/sui/pull/1535/files.

The main change from this PR would be adding whitespace-pre to the CSS.

Would you like me to make a separate PR with the CSS changes?

[666lcz]

@Andrew47 , if you examine the changed files, you will see the two PRs fix different things. This PR fixes the SDK <> backend, while your PR fixes the layout. We need both! Without this change, #1535 is not going to work

[666lcz]

Rebase and re-test

@Andrew47 , note that the devnet gateway is currently down, if you would like to repro this locally,

1. follow https://github.com/MystenLabs/sui/tree/main/explorer/client#connecting-to-local-rpc-server
   2.Use this command to publish a package

cd <sui repo>
wallet publish --path sui_programmability/tutorial --gas-budget 30000

Otherwise you can just watch the video below where I have thoroughly test the flow

CleanShot.2022-05-04.at.11.15.01.mp4

[apburnie]

Given the backend is down, the video proof will do for now.