Move schedule constraints to the top of the planning page and display the configuration up front

move start date, end date and budget to the top of the page
add new copy (see image for copy changes)
Remove the schedule constraints button
Add a confirmation button to let user confirm their variables.
[to discuss] Before hitting confirm, grey out the other components of the block? cc @boazsender @susanpark wdyt of this behavior since we're adding a confirmation button? Alternatively, if it's easier we could update in real-time.

bocoup / blocks-capacity-planner