Fix broken links in documentation

Change-Id: I582341a001d9541db82794eb64ddfc32c6582b83

doc/manual/src/contributing/hacking.md

@@ -148,7 +148,7 @@ You can also build Lix for one of the [supported platforms](#platforms).
 
 Lix can be built for various platforms, as specified in [`flake.nix`]:
 
-[`flake.nix`]: https://git.lix.systems/lix-project/lix/lix/branch/main/flake.nix
+[`flake.nix`]: https://git.lix.systems/lix-project/lix/src/branch/main/flake.nix
 
 - `x86_64-linux`
 - `x86_64-darwin`
@@ -229,7 +229,7 @@ Lix uses a string with the following format to identify the *system type* or *pl
 
 It is set when Lix is compiled for the given system, and determined by [Meson's `host_machine.cpu_family()` and `host_machine.system()` values](https://mesonbuild.com/Reference-manual_builtin_host_machine.html).
 
-For historic reasons and backward-compatibility, some CPU and OS identifiers are translated from the GNU Autotools naming convention in [`meson.build`](https://git.lix.systems/lix-project/lix/blob/main/meson.build) as follows:
+For historic reasons and backward-compatibility, some CPU and OS identifiers are translated from the GNU Autotools naming convention in [`meson.build`](https://git.lix.systems/lix-project/lix/src/branch/main/meson.build) as follows:
 
 | `host_machine.cpu_family()`             | Nix                 |
 |----------------------------|---------------------|

doc/manual/src/introduction.md

@@ -148,7 +148,7 @@ paths) are set.
 
 For example, the following command gets all dependencies of the
 Pan newsreader, as described by [its
-Nix expression](https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/newsreaders/pan/default.nix):
+Nix expression](https://github.com/NixOS/nixpkgs/blob/master/pkgs/by-name/pa/pan/package.nix):
 
 ```console
 $ nix-shell '<nixpkgs>' --attr pan

doc/manual/src/package-management/basic-package-mgmt.md

@@ -126,7 +126,7 @@ $ nix-env --install --attr nixpkgs.subversion
 ```
 
 will install the package called `subversion` from `nixpkgs` channel (which is, of course, the
-[Subversion version management system](http://subversion.tigris.org/)).
+[Subversion version management system](https://subversion.apache.org/)).
 
 > **Note**
 >

lix/libexpr/builtins/toXML.md

@@ -47,7 +47,7 @@ stdenv.mkDerivation (rec {
 ```
 
 The builder is supposed to generate the configuration file for a
-[Jetty servlet container](http://jetty.mortbay.org/). A servlet
+[Jetty servlet container](https://jetty.org/). A servlet
 container contains a number of servlets (`*.war` files) each
 exported under a specific URI prefix. So the servlet configuration
 is a list of sets containing the `path` and `war` of the servlet

lix/libstore/settings/netrc-file.md

@@ -17,7 +17,7 @@ format:
     password my-password
 
 For the exact syntax, see [the `curl`
-documentation](https://ec.haxx.se/usingcurl-netrc.html).
+documentation](https://everything.curl.dev/usingcurl/netrc.html).
 
 > **Note**
 >