Suggestion: use "Vcs-*" information from Debian's Sources.gz

Debian stores information about the version control system of a package. This might be useful information to store and return whenever possible. Example information from Debian:

```
Package: ed
Binary: ed
Version: 1.17-1
Maintainer: xxxx
Uploaders: xxxx
Build-Depends: debhelper-compat (= 13)
Architecture: any
Standards-Version: 4.5.1
Format: 3.0 (quilt)
Files:
9be19876c935f5192681329b70d0f635 1818 ed_1.17-1.dsc
ec44da3c77341543fe15902540f132fb 90863 ed_1.17.orig.tar.gz
e009ba526e1a6c6d8d5e2fc8ee887c87 8464 ed_1.17-1.debian.tar.xz
Vcs-Browser: https://salsa.debian.org/debian/ed
Vcs-Git: https://salsa.debian.org/debian/ed.git
Checksums-Sha256:
05e781f628a47e71e25851dbd252a884b58f70226f0657b4b1b575a52bcc1e8d 1818 ed_1.17-1.dsc
6c84ce06fea002fe76f19bf66c3807edafd898b8ab0f15852e1497d48f44d96d 90863 ed_1.17.orig.tar.gz
8cc3b3c1bfb139d8ac635d4fefa47f2aa289d007fcd1da553bad97ce26fe7f88 8464 ed_1.17-1.debian.tar.xz
Homepage: https://www.gnu.org/software/ed/
Package-List:
ed deb editors optional arch=any
Testsuite: autopkgtest
Directory: pool/main/e/ed
Priority: source
Section: editors
```

The interesting field is `Vcs-Git`. Possibly `Homepage` could also be interesting. These could optionally be used to cross correlate information from other distributions and aggregate information.