📒 apps/git: Drop gpg workaround, add git pull strategy

This commit does two things to my .gitconfig:

• Drops [gpg] section, since Fedora now packages GnuPG v2 instead of v1 for some time now
• Adds a [pull] section with rebase as default pull strategy to address warning message (see below)

warning: Pulling without specifying how to reconcile divergent branches is
discouraged. You can squelch this message by running one of the following
commands sometime before your next pull:

  git config pull.rebase false  # merge (the default strategy)
  git config pull.rebase true   # rebase
  git config pull.ff only       # fast-forward only

You can replace "git config" with "git config --global" to set a default
preference for all repositories. You can also pass --rebase, --no-rebase,
or --ff-only on the command line to override the configured default per
invocation.