Display Add Tool on prof if current user is user.
Create a simple (read as incomplete) tool partial.
Add comment explaining blank Tools#index action.

[skip ci]
Add no tools profile display locale copy.
Make user tools spec name more intention revealing
Require authentication for tool controller actions

All tool controller actions require authentication except for the index action.
Allow enabling/disabling of Tools in the UI/routes

Only display Tool UI in existing views if the ENV variable TOOLS_ENABLED is set
to true. If it is anything other than true, they will not be displayed. It is
set to true by default.