Drop aerc

Favoring a more integrated solution for PIM/Mail/RSS. Sadly at the
moment that's Thunderbird and I can't exactly manage tbird configs.

.config/aerc/aerc.conf

@@ -1,38 +0,0 @@
-[ui]
-index-format=%D %-17.17n %Z %s
-timestamp-format=Jan 02 15:04
-sidebar-width=20
-empty-message=(no messages)
-empty-dirlist=(no folders)
-mouse-enabled=false
-new-message-bell=true
-pinned-tab-marker='`'
-dirlist-format=%n %>r
-sort=date
-next-message-on-delete=true
-stylesets-dirs=/home/trysdyn/.config/aerc/stylesets:/usr/share/aerc/stylesets/
-styleset-name=base16
-
-[viewer]
-pager=most -w
-alternatives=text/plain,text/html
-show-headers=false
-header-layout=From,To,Cc,Bcc,Date,Subject
-always-show-mime=false
-completion-delay=250ms
-completion-popovers=true
-
-[compose]
-editor=
-header-layout=To,From,Cc,Bcc,Subject
-address-book-cmd=
-
-[filters]
-subject,~^\[PATCH=awk -f /usr/share/aerc/filters/hldiff
-text/html=/usr/share/aerc/filters/html
-text/*=awk -f /usr/share/aerc/filters/plaintext
-
-[templates]
-template-dirs=/usr/share/aerc/templates/
-quoted-reply=quoted_reply
-forwards=forward_as_body