[README] Overhaul paragraph "How to install Patchmanager" (#396)

* Overhaul paragraph "How to install Patchmanager"

* Avoid two "also" in one sentence

Author: Olf0

README.md

@@ -7,10 +7,9 @@ Since version 3.0, Patchmanager does not modify original files on mass storage,
 
 Note that Patchmanager does not install an application icon on the launcher, but creates a new entry in SailfishOS' Settings app.
 
-To install Patchmanager you should use Storeman, which can be installed via the [Storeman-Installer](https://openrepos.net/content/osetr/storeman-installer), but you also may download the [recent Patchmanager RPM from OpenRepos](https://openrepos.net/content/patchmanager/patchmanager) and install it manually.
-The modern alternative to using OpenRepos is the SailfishOS:Chum community repository, which can be easily accessed with the SailfishOS:Chum GUI application or with the ususal command line tools (`pkcon`, `zypper`), after downloading either the SailfishOS:Chum GUI application RPM or the SailfishOS:Chum repo helper RPM from [chumrpm.netlify.app](https://chumrpm.netlify.app/) and installing it.  Both RPMs are also offered at OpenRepos (but the GUI app only for the recent SailfishOS release) and hence are installable by Storeman.
+To install a recent Patchmanager the SailfishOS:Chum community repository can be used, which is easily accessed with the SailfishOS:Chum GUI application, which in turn can be installed via the [SailfishOS:Chum GUI Installer](https://openrepos.net/content/olf/sailfishoschum-gui-installer).  Alternatively Patchmanager can be installed from [its OpenRepos repository](https://openrepos.net/user/16848/programs) using Storeman, which can be installed via the [Storeman Installer](https://openrepos.net/content/olf/storeman-installer).  While these two sources can also be used to manually download and install Patchmanager, you may alternatively obtain Patchmanager RPMs from [its releases page at GitHub](https://github.com/sailfishos-patches/patchmanager/releases).  Note that the Patchmanager's OpenRepos repository and GitHub releases page also offer the final releases of Patchmanager 3.0 for SailfishOS < 3.4.0 and Patchmanager 2.3.3 for SailfishOS < 2.2.x.
 
-Modern Patches for Patchmanager are provided via [the Web Catalog](https://coderus.openrepos.net/pm2/projects/), while older Patches were provided as [RPMs at OpenRepos](https://openrepos.net/category/patches) and some of them are still maintained.
+Modern Patches for Patchmanager 3 are provided via [the Web Catalog](https://coderus.openrepos.net/pm2/projects/), while older Patches were provided as [RPMs at OpenRepos](https://openrepos.net/category/patches) and some of them are still maintained.
 Mind that many Patches were first released at OpenRepos but later migrated to the Web Catalog: For these you will find outdated RPMs, hence always search in the Web Catalog first.
 
 If you want to translate ("localise") Patchmanager to a language you know well or enhance an existing translation, please read Patchmanager's corresponding Wiki page [Translations ("i18n", "l10n")](https://github.com/sailfishos-patches/patchmanager/wiki/Translations-(%22i18n%22,-%22l10n%22)).