README.md: Update "quickest start"

Remove the instructions, instead using Gentoo Wiki links to provide
instructions for installing the repository and generating metadata. This
will be less error prone (and will stay up-to-date if there are any
changes to the process.)

Rename "quickest start" to the more boring title of "quick start" (since
"quickest start" implies there's a slightly slower "quick start" hiding
somewhere.)

Signed-off-by: hololeap <hololeap@protonmail.com>

Author: hololeap

README.rst

@@ -13,35 +13,17 @@ Find us in ``#gentoo-haskell`` on `libera.chat`_!
 
 .. _libera.chat: https://libera.chat
 
-Quickest start
-==============
-
-First, let's enable the Gentoo Haskell overlay using the eselect-repository method::
-
-    # Install eselect-repository if you don't already have it
-    emerge app-eselect/eselect-repository
-    # Fetch and output the list of overlays
-    eselect repository list
-    eselect repository enable haskell
-
-Finally, we need to unmask the overlay (this does not apply if your system
-is already running on the ~testing branch)::
-    # Unmask ~testing versions for your arch:
-    echo "*/*::haskell" >> /etc/portage/package.accept_keywords
+Quick start
+===========
 
-And here is the trick to speed up metadata resolution a bit.
-If you happen to use ``eix-sync`` for rsyncs you might
-like the following ``/etc/eix-sync.conf``::
+Enable the ``haskell`` repository in the normal manner explained here::
 
-    *
-    @egencache --jobs="$(($(nproc) + 1))" --repo=haskell --update --update-use-local-desc
+https://wiki.gentoo.org/wiki/Eselect/Repository
 
-It basically means:
+Optionally, enable a sync hook to automatically generate metadata for you::
 
-- sync overlays in layman list before the main tree sync
+https://wiki.gentoo.org/wiki//etc/portage/repo.postsync.d#Pkgcore_example
 
-- generate metadata for haskell repo after main
-  tree sync is done, using N+1 cores
 
 Overlay Priority
 ================