icinga: Removal of icinga addon

- As discussed in the Dev conf call on 2024-Jan-08
- The 1.x version of Icinga has been EOL since 2018
- The 2.x version would require a complete new configuration approach as the settings
   and options are completely different to 1.x and so would be a start from scratch.
- removal of icinga from make.sh file
- removal of lfs file
- removal of rootfile
- removal of configuration file
- removal of backup includes file

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Acked-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

config/backup/includes/icinga

@@ -1 +0,0 @@
-/etc/icinga

config/icinga/icinga.conf

@@ -1,31 +0,0 @@
-Listen 1010
-
-<VirtualHost *:1010>
-	ScriptAlias /icinga/cgi-bin /usr/share/icinga/cgi-bin
-	Alias /icinga /usr/share/icinga/
-
-	RewriteEngine on
-	RewriteRule ^/$ /icinga/ [R]
-
-	<Directory /usr/share/icinga/cgi-bin>
-		Options ExecCGI
-		AllowOverride None
-
-		AuthName "Icinga Access"
-		AuthType Basic
-		AuthUserFile /etc/icinga/htpasswd.users
-
-		Require valid-user
-	</Directory>
-
-	<Directory /usr/share/icinga/>
-		Options None
-		AllowOverride All
-
-		AuthName "Icinga Access"
-		AuthType Basic
-		AuthUserFile /etc/icinga/htpasswd.users
-
-		Require valid-user
-	</Directory>
-</VirtualHost>