Semi-automatic update. These checks were done:
- built on NixOS
- ran `/nix/store/rq0ny7n6qfg7sgjqa5ki2ds6v3gzjwil-discount-2.2.3/bin/markdown help` got 0 exit code
- ran `/nix/store/rq0ny7n6qfg7sgjqa5ki2ds6v3gzjwil-discount-2.2.3/bin/markdown -V` and found version 2.2.3
- ran `/nix/store/rq0ny7n6qfg7sgjqa5ki2ds6v3gzjwil-discount-2.2.3/bin/markdown --version` and found version 2.2.3
- found 2.2.3 with grep in /nix/store/rq0ny7n6qfg7sgjqa5ki2ds6v3gzjwil-discount-2.2.3
- found 2.2.3 in filename of file in /nix/store/rq0ny7n6qfg7sgjqa5ki2ds6v3gzjwil-discount-2.2.3
* pkgs: refactor needless quoting of homepage meta attribute
A lot of packages are needlessly quoting the homepage meta attribute
(about 1400, 22%), this commit refactors all of those instances.
* pkgs: Fixing some links that were wrongfully unquoted in the previous
commit
* Fixed some instances
