docs: create pre/post-deploy getting started (#1362)

Signed-off-by: Meg McRoberts <meg.mcroberts@dynatrace.com>
Signed-off-by: Simon Schrottner <simon.schrottner@gmail.com>
Signed-off-by: Simon Schrottner <simon.schrottner@dynatrace.com>
Signed-off-by: Meg McRoberts <mmcroberts@cloudbees.com>
Signed-off-by: Adam Gardner <26523841+agardnerIT@users.noreply.github.com>
Signed-off-by: Meg McRoberts <DreidelLhasa@yahoo.com>
Co-authored-by: Simon Schrottner <simon.schrottner@gmail.com>
Co-authored-by: Giovanni Liva <giovanni.liva@dynatrace.com>
Co-authored-by: Adam Gardner <26523841+agardnerIT@users.noreply.github.com>