Command line parameter for simple view differs from documentation

[capocasa]

In issue #474 a simpler view mode was added.

I'm running remark42 as binary launched from a systemd service and I was tearing my hair out why the --simple-view parameter was erroring out, until a brief code inspection revealed the parameter is actually called --simpler-view (note the r), unlike documentation and issue.

I would suggest to simply change it to conform with documentation with no concern for backward compatibility- if you can figure out the undocumented param name you can figure out it was fixed, and I suspect most users of this feature are using docker...

In any case thank you for making remark42!!! As a Nim user I got really fond of having fast-running single binaries as web services so this fits like a glove.