Overview page for Connecting

Create overview page for Connecting including numbered list of steps with links to more detail (subsection pages). See https://hcc.unl.edu/docs/accounts/ as an example

created branch 28-overview-page-for-connecting to address this issue

created merge request !178 (closed) to address this issue

mentioned in merge request !178 (closed)

mentioned in merge request !179 (merged)

closed via merge request !179 (merged)

mentioned in commit dbc09199