This Fixes #1054

Issue #1054 is fixed with this PR.
Added hyperlink to <a href=  so that users can open the notebook in another tab.
The current functionality remains intact in which on click of the notebook opens the notebook in the same tab without reloading.
please use `ui_utils.url_maker('edit.html')` to create these links, like editor_tab does, instead of pasting them together.  it's clearer, and it will be more maintainable.