[DOC beta] Update link-to helper API docs and yuidoc.json cleanup

Updated `{{link-to}}` API documentation with an inline form as requested in #10041.

I also found out that the documentation was not being built properly and that the new htmlbars related packages are omitted by the doc generation task so I also updated `yuidoc.json` with paths to the new htmlbars packages and removed non-existent handlebars ones.

Hope it helps.