docs: Update IRC links to Libera.Chat

#mgmtconfig has moved to Libera.Chat as the primary channel for IRC
communications. Update the documentation to reflect this.
Libera.Chat doesn't provide a first-party web portal but does recommend
a few in the linked documentation on the website. As there is no
suitable replacement for webchat.freenode.net, link to the "Choosing an
IRC client" page instead.

Signed-off-by: Joe Groocock <me@frebib.net>

README.md

@@ -6,7 +6,7 @@
 [![Build Status](https://img.shields.io/travis/purpleidea/mgmt/master.svg?style=flat-square)](http://travis-ci.org/purpleidea/mgmt)
 [![Build Status](https://github.com/purpleidea/mgmt/workflows/.github/workflows/test.yaml/badge.svg)](https://github.com/purpleidea/mgmt/actions/)
 [![GoDoc](https://img.shields.io/badge/godoc-reference-5272B4.svg?style=flat-square)](https://godoc.org/github.com/purpleidea/mgmt)
-[![IRC](https://img.shields.io/badge/irc-%23mgmtconfig-orange.svg?style=flat-square)](https://webchat.freenode.net/?channels=#mgmtconfig)
+[![IRC](https://img.shields.io/badge/irc-%23mgmtconfig-orange.svg?style=flat-square)](ircs://irc.libera.chat:6697/#mgmtconfig)
 [![Patreon](https://img.shields.io/badge/patreon-donate-yellow.svg?style=flat-square)](https://www.patreon.com/purpleidea)
 [![Liberapay](https://img.shields.io/badge/liberapay-donate-yellow.svg?style=flat-square)](https://liberapay.com/purpleidea/donate)
 
@@ -66,7 +66,7 @@ Come join us in the `mgmt` community!
 
 | Medium | Link |
 |---|---|
-| IRC | [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig) on Freenode |
+| IRC | [#mgmtconfig](ircs://irc.libera.chat:6697/#mgmtconfig) on Libera.Chat |
 | Twitter | [@mgmtconfig](https://twitter.com/mgmtconfig) & [#mgmtconfig](https://twitter.com/hashtag/mgmtconfig) |
 | Mailing list | [mgmtconfig-list@redhat.com](https://www.redhat.com/mailman/listinfo/mgmtconfig-list) |
 | Patreon | [purpleidea](https://www.patreon.com/purpleidea) on Patreon |

docs/faq.md

@@ -53,10 +53,10 @@ find a number of tutorials online.
 3. Spend between four to six hours with the [golang tour](https://tour.golang.org/).
 Skip over the longer problems, but try and get a solid overview of everything.
 If you forget something, you can always go back and repeat those parts.
-4. Connect to our [#mgmtconfig](https://webchat.freenode.net/?channels=#mgmtconfig)
-IRC channel on the [Freenode](https://freenode.net/) network. You can use any
-IRC client that you'd like, but the [hosted web portal](https://webchat.freenode.net/?channels=#mgmtconfig)
-will suffice if you don't know what else to use.
+4. Connect to our [#mgmtconfig](ircs://irc.libera.chat:6697/#mgmtconfig)
+IRC channel on the [Libera.Chat](https://libera.chat/) network. You can use any
+IRC client that you'd like, including any web-based portal will suffice if you
+don't know what else to use. [Here are a few suggestions.](https://libera.chat/guides/clients)
 5. Now it's time to try and starting writing a patch! We have tagged a bunch of
 [open issues as #mgmtlove](https://github.com/purpleidea/mgmt/issues?q=is%3Aissue+is%3Aopen+label%3Amgmtlove)
 for new users to have somewhere to get involved. Look through them to see if
@@ -376,7 +376,7 @@ which definitely existed before the band did.
 
 ### You didn't answer my question, or I have a question!
 
-It's best to ask on [IRC](https://webchat.freenode.net/?channels=#mgmtconfig)
+It's best to ask on [IRC](ircs://irc.libera.chat:6697/#mgmtconfig)
 to see if someone can help you. If you don't get a response from IRC, you can
 contact me through my [technical blog](https://purpleidea.com/contact/) and I'll
 do my best to help. If you have a good question, please add it as a patch to