remove config extract magic

[Segaja]

relates to https://github.com/vcs-python/vcspull/issues/360

• tests not working yet
• auto completion is most likely broken
• removed vcspull sync <url>
• documentation for config change missing

[CLAassistant]

All committers have signed the CLA.

[Segaja]

${HOME}/develop/github.com/vcs-python/checkouts:
  dotfiles:
    vcs: git
    options:
      remotes:
        origin: ssh://[email protected]/Segaja/dotfiles.git
  procpath:
    vcs: hg
    options:
      url: https://heptapod.host/saajns/procpath
  subversion:
    vcs: svn
    options:
      url: https://svn.apache.org/repos/asf/subversion/trunk
~/develop/github.com/vcs-python/checkouts2:
  discordbot:
    vcs: git
    options:
      remotes:
        origin: ssh://[email protected]/Segaja/discordbot.git

~/develop/github.com/vcs-python/checkouts3:
  discordbot:
    vcs: git
    options:
      remotes:
        origin: ssh://[email protected]/Segaja/discordbot.git

[tony]

@Segaja Nice rebase. 💪