Consolidate information about bootstrapping into one place #851
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Previously, 'How to build and run' had a long section on the different
stages of boostrap. But new contributors aren't interested in bootstrap;
they want to start their build (because they heard it takes forever and
want to start it so they aren't waiting more than necessary).
This moves the section on stages into the bootstrapping page, and links
there instead of discussing it on the main page.