Make second level headers closer to the content below than to the content above
Add margin to <pre>
run-locally: improve appearance of the command line
run-locally: make the paragraph justified

Putting lines next to each other allows the HTML engine to layout the
text evenly in the page.
run-locally: Fix typo
run-locally: do not show the whole README link
capstan: Embed the link to Capstanfile documentation in appropriate section
capstan: Remove links to the mailing list and twitter

These are not capstan-specific
capstan: Rename "compatibility" section into "installation"
run-locally: describe how to use capstan to run OSv

For a first-time user using Capstan will be much easier than building
from sources. I think we should promote that approach. If someone
want's to run form sources, there's OSv README file.