get rid of jammy-security duplication

due to merging !3 (merged) we duplicate selected packages that are part of jammy-security.

my idea to fix this: let one of the two just be a stub and redirect it to the other path, probably via adapting the nginx.conf (need to adapt the script that creates the nginx.conf)

why is this a possible approach? because archive.ubuntu.com and security.ubuntu.com are actually the same under the hood. See here, they resolve to the same IPs (the order of IPs is jumping around):

sven@sven-T14:~$ dig archive.ubuntu.com

; <<>> DiG 9.18.18-0ubuntu0.22.04.2-Ubuntu <<>> archive.ubuntu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19202
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;archive.ubuntu.com.		IN	A

;; ANSWER SECTION:
archive.ubuntu.com.	20	IN	A	91.189.91.81
archive.ubuntu.com.	20	IN	A	91.189.91.83
archive.ubuntu.com.	20	IN	A	91.189.91.82
archive.ubuntu.com.	20	IN	A	185.125.190.39
archive.ubuntu.com.	20	IN	A	185.125.190.36

;; Query time: 16 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Thu Mar 14 10:56:56 CET 2024
;; MSG SIZE  rcvd: 127

sven@sven-T14:~$ dig security.ubuntu.com

; <<>> DiG 9.18.18-0ubuntu0.22.04.2-Ubuntu <<>> security.ubuntu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42675
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;security.ubuntu.com.		IN	A

;; ANSWER SECTION:
security.ubuntu.com.	5	IN	A	185.125.190.36
security.ubuntu.com.	5	IN	A	185.125.190.39
security.ubuntu.com.	5	IN	A	91.189.91.81
security.ubuntu.com.	5	IN	A	91.189.91.82
security.ubuntu.com.	5	IN	A	91.189.91.83

;; Query time: 20 msec
;; SERVER: 127.0.0.53#53(127.0.0.53) (UDP)
;; WHEN: Thu Mar 14 10:56:58 CET 2024
;; MSG SIZE  rcvd: 128