alphabetize Messaging Client Alternatives by protocols (#893)

- As per updated Style Guide, Alternatives section should also be
  alphabetized.
- Also added ToC entries for `Messaging {Client,Server} Alternatives by
  protocols`

Reviewed-on: https://codeberg.org/small-hack/open-slopware/pulls/893
Reviewed-by: Admin <vleermuis-admin@noreply.codeberg.org>

README.md

@@ -104,7 +104,9 @@ Any other questions? Please check out our [FAQ](./FAQ.md), and if your question
     * [Alternatives](#mapping-alternatives)
   * [Messaging](#messaging)
     * [Messaging Clients](#messaging-clients)
+      * [Messaging Client Alternatives by protocols](#messaging-client-alternatives-by-protocols)
     * [Messaging Servers](#messaging-servers)
+      * [Messaging Server Alternatives by protocols](#messaging-server-alternatives-by-protocols)
   * [Microcontroller Tools and Libraries](#microcontroller-tools-and-libraries)
     * [Alternative Microcontroller Tools and Libraries](#alternative-microcontroller-tools-and-libraries)
   * [Networking](#networking)
@@ -948,15 +950,15 @@ This is a section for repos that are similar to this one either because they are
 
 > [!Note]
 > #### Messaging Client Alternatives by protocols
+> - IRC clients overall don't seem to have AI-committed code
 > - [matrix]
 >   - [Cinny](https://github.com/cinnyapp/cinny) (web)
 >   - [FluffyChat](https://github.com/krille-chan/fluffychat) (cross-platform)
 >   - [nheko](http://nheko.im/) (desktop, Linux phones)
+> - [WeeChat](https://github.com/weechat/weechat): Multi-protocol
 > - [xmpp](https://xmpp.org/)
 >   - [Conversations](https://conversations.im/) (android)
 >   - [Kaidan](https://invent.kde.org/network/kaidan) (cross-platform)
-> - [WeeChat](https://github.com/weechat/weechat): Multi-protocol
-> - IRC clients overall don't seem to have AI-committed code
 
 ### Messaging Servers