Remove scope from toc entry IDs

Happens on CLI and Web, though the web one is a bit artificial.

E.g. cirosantilli.com/x86-paging#toc-x86-paging/sample-code should instead be just: cirosantilli.com/x86-paging#toc-sample-code. Links from headers to currently work however,

On web will require extra caution after we decided to initially stop culling scopes: missing header metadata such as like button, same topic and issue link on headers under a scope.