user-manual: reorganize fetch discussion, add internals, etc.
Keep git remote discussion in the first chapter, but postpone lower-level git fetch usage (to fetch individual branches) till later. Import a bunch of slightly modified text from the readme to give an architectural overview at the end. Add more discussion of history rewriting. And a bunch of other miscellaneous changes.... Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
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