Dev Tools Requirements: update section on using "gbp buildpackage" command

Robert P. J. Dayrequested to merge
rpjday/user-documentation:rpjday/git_buildpackage into main

That entire section was noticeably out of date and lacked some relevant advice for the developer; hence, the following fixes:

  • drop the unnecessary promotion of Git
  • drop insistence that sbuild is used, clarify that building can use a number of different builders (default "debuild")
  • correct name of user config file from .gbp to .gbp.conf
  • add list of all gbp configuration files as listed in the man page
  • provide two links to relevant man page and wiki page

Signed-off-by: Robert P. J. Day rpjday@crashcourse.ca

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