organize the tam handbook table of contents

Why is this change being made?

organizing TOC on main TAM page, deprecate the manual duplicative TOC on subpages to link back to the main page

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what