chore(install): add Github source links to all fetch_and_deploy scripts

77 additional install scripts had fetch_and_deploy_gh_release calls but
no GitHub link in the Source header. Merged the primary app repo into
the Source header as:
  # Source: https://website.com/ | Github: https://github.com/OWNER/REPO

Where multiple fetch_and_deploy calls existed (app + dependency), the
primary app repo was selected:
- ersatztv: ErsatzTV/ErsatzTV (not ffmpeg)
- firefly: firefly-iii/firefly-iii (not data-importer)
- komga: gotson/komga (not kepubify dep)
- sabnzbd: sabnzbd/sabnzbd (not par2cmdline-turbo dep)
- signoz: SigNoz/signoz (not otel-collector)
- tunarr: chrisbenincasa/tunarr (not ffmpeg dep)

Also fixed cosmos-install.sh double https:// in Source URL.

Skipped: autocaliweb (source already on codeberg, GitHub repos are deps only)

install/projectsend-install.sh

@@ -3,7 +3,7 @@
 # Copyright (c) 2021-2026 community-scripts ORG
 # Author: bvdberg01
 # License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
-# Source: https://www.projectsend.org/
+# Source: https://www.projectsend.org/ | Github: https://github.com/projectsend/projectsend
 
 source /dev/stdin <<<"$FUNCTIONS_FILE_PATH"
 color