adjust README, drop matrix, add IRC (welcome back, old man)

Author: 4nd3r

README.md

@@ -2,43 +2,14 @@
 
 [skonfig](https://skonfig.li) is a system configuration and automation framework
 designed to work with all systems, from your toaster to the data centre.
+All you need is an SSH connection and a POSIX/UNIX-like shell environment.
+And best of all: you already know how to use it (if you know shell scripts).
 
-skonfig uses three main repositories:
+skonfig has three main repositories:
 
 * [skonfig](https://github.com/skonfig/skonfig) - implementation of the **skonfig** executable,
-* **base** - explorer and types for **general use**,
+* [base](https://github.com/skonfig/base) - explorer and types for **general use**,
 * [extra](https://github.com/skonfig/extra) - **special purpose** types and incubator for new types.
 
 Check out the [skonfig](https://github.com/skonfig/skonfig) repository to learn
 how to get started.
-
-**Need support?** You can find us in `#skonfig:matrix.org` ([matrix?](https://matrix.org/faq/)).
-
-## Documentation
-
-Most parts of the [cdist documentation](https://www.cdi.st/manual/latest/) still
-apply, but there are some differences:
-
-* `skonfig` does only `config` (see `skonfig -h`),
-* types are managed in sets (like this one),
-* type manifests can be a directory of scripts,
-* `gencode-*` can be a directory of scripts,
-* some types behave differently and it's recommended to consult the `man.rst`
-  files in *base* and *extra*.
-
-## What are *base* and *extra*?
-
-**Base** explorers and types are used to change the state of the operating
-system or core components of it and are not for some specific piece of
-software. Furthermore, the quality requirements for inclusion in base are
-higher than for extra.
-
-**Extra** contains types for specific purposes like configuring software or
-services which don't belong to the operating system and also serves as an
-incubator for new types.
-
-Even more types can be found in sets specialised in helping you configure a
-specific piece of software. Some of these sets can be found in this organization.
-
-And being a fork of [cdist](https://cdi.st/) originally, your cdist manifests
-and types will continue to work with skonfig with no or minimal adjustments.