import vim documentation from changeset 04c4ef8c0a1b
remove non-unix os notes
removed gui notes
Makefile: remove os_* and gui* references
Makefile: remove reference to config.mk
update tags after removing os_* and gui*
Merge initial work by @rjw57
Merge pull request #3 from rjw57/issue-2

Merge in the initial bootstrap work