emacs: bringing back C-a and C-e

I'm bringing back the default Emacs' bindings for C-a and C-e. The idea
is that these bindings actually make more sense than the Vim ones. These
caused two conflicts:

1. The `expand-region` package was already using the C-e binding. I've
   simply removed this package, because in these years I've never used
   it, so I guess it's not for me.
2. The `evil-numbers/inc-at-pt` package was already using the C-a
   binding. I do use this one, but I moved it into C-c +, which is
   similar to what I already use for `evil-numbers/dec-at-pt`. It's not
   too bad if I have to do it once (and if I have to repeat it there's
   always `.`).

Signed-off-by: Miquel Sabaté Solà <msabate@suse.com>

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