download: use downstream packages for Fedora & EL

Our package repositories for Fedora & EL aren't very useful, since we keep up-to-date packages in downstream. They're delayed only by downstream gating, which users can get around by using the appropriate testing repositories.

This change was also prompted by lack of proper OBS buildroot for EL8 which lacks the needed powertools repo with libuv-devel.

content/pages/en/download.rst

@@ -4,16 +4,12 @@
 :lang: en
 :menuorder: 1
 
-Official upstream packages
-==========================
+We recommend using the latest Knot Resolver version. Our upstream releases
+undergo extensive automated testing and are suitable for production.
 
-We recommend using these official upstream repositories with the latest Knot
-Resolver. Packages available in your distribution's repositories are often
-outdated (especially in Debian / Ubuntu).
-
-Our latest version undergoes extensive automated testing and is suitable for
-production. Follow the instructions below to add our upstream package repository
-to your system. It contains the latest Knot Resolver and latest compatible Knot DNS.
+Packages available in your distribution's may be outdated. Follow the
+instructions below to obtain the latest Knot Resolver version for your
+distribution.
 
 Please note that we occasionally release a major version which may require
 manual upgrade. Please subscribe to our `knot-resolver-announce
@@ -24,6 +20,8 @@ to be notified of new releases, including upgrade instructions if necessary.
 Debian / Ubuntu
 ---------------
 
+Install our upstream repositories using these steps:
+
 ::
 
    wget https://secure.nic.cz/files/knot-resolver/knot-resolver-release.deb
@@ -34,23 +32,38 @@ Debian / Ubuntu
 For complete matrix of supported releases and architectures, see
 `home:CZ-NIC:knot-resolver-latest`_.
 
-CentOS 7, 8
------------
+Enterprise Linux 7, 8
+---------------------
+
+Use Fedora EPEL.
 
 ::
 
-   yum install -y https://secure.nic.cz/files/knot-resolver/knot-resolver-release.el.rpm
+   yum install -y epel-release
    yum install -y knot-resolver
 
+Package updates are delayed by about 2 weeks after release. To obtain the
+latest released version early, you can use the epel-testing repository.
+
+::
+
+   yum install -y --enablerepo epel-testing knot-resolver
+
 Fedora
 ------
 
+Use the distribution's repositories where we maintain up-to-date packages.
+
 ::
 
-   dnf install -y https://secure.nic.cz/files/knot-resolver/knot-resolver-release.fedora.rpm
    dnf install -y knot-resolver
 
-For Fedora Rawhide, use distribution packages instead.
+Package releases are delayed by about a week. To obtain the latest released
+version early, you can use the updates-testing repository.
+
+::
+
+   dnf install -y --enablerepo updates-testing knot-resolver
 
 OpenSUSE Leap / Tumbleweed
 --------------------------