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Both packages will get EOLed within the lifetime of 20.09. `nextcloud17` can be removed entirely (the attribute-path is kept however to provide meaningful errors), however `nextcloud18` must be kept as `insecure` to make sure that users from `nextcloud17` can properly upgrade to `nextcloud19` on NixOS 20.09.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.