docs: Update various broken/redirected links

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

CONTRIBUTING.md

@@ -114,7 +114,7 @@ development tools appropriate for your operating system, including:
  - Meson
  - Ninja
  - Gettext (19.7 or newer)
- - a [C99 compatible compiler](https://wiki.gnome.org/Projects/GLib/CompilerRequirements)
+ - a [C99 compatible compiler](./docs/toolchain-requirements.md)
 
 Up-to-date instructions about developing GNOME applications and libraries
 can be found on [the GNOME Developer Center](https://developer.gnome.org).
@@ -187,7 +187,7 @@ With each code review, we intend to:
     adequately tested, either through requiring tests to be submitted at the
     same time, or as a follow-up.
  0. Ensure that all new APIs are documented and have [introspection
-    annotations](https://wiki.gnome.org/Projects/GObjectIntrospection/Annotations).
+    annotations](https://gi.readthedocs.io/en/latest/annotations/giannotations.html).
  0. Check that the contribution is split into logically separate commits, each
     with a good commit message.
  0. Encourage further high quality contributions.
@@ -272,4 +272,4 @@ GLib to follow a few rules:
 
 If you have been contributing to GLib for a while and you don’t have commit
 access to the repository, you may ask to obtain it following the [GNOME account
-process](https://wiki.gnome.org/AccountsTeam/NewAccounts).
+process](https://wiki.gnome.org/Infrastructure/NewAccounts).

docs/reference/gio/gdbus-codegen.xml

@@ -1156,7 +1156,7 @@ on_handle_hello_world (MyAppFrobber           *interface,
   <para>
     The generated C code currently happens to be annotated with <ulink
     url="http://www.gtk.org/gtk-doc/">gtk-doc</ulink> / <ulink
-    url="https://wiki.gnome.org/Projects/GObjectIntrospection">GObject
+    url="https://gi.readthedocs.io/en/latest/">GObject
     Introspection</ulink> comments / annotations. The layout and
     contents might change in the future so no guarantees about
     e.g. <literal>SECTION</literal> usage etc. is given.

docs/reference/glib/building.xml

@@ -60,7 +60,7 @@
       Before you can compile the GLib library, you need to have
       various other tools and libraries installed on your system.
       If you are building from a release archive, you will need
-      <ulink url="https://wiki.gnome.org/Projects/GLib/CompilerRequirements">a compliant C toolchain</ulink>,
+      <ulink url="https://gitlab.gnome.org/GNOME/glib/-/blob/main/docs/toolchain-requirements.md">a compliant C toolchain</ulink>,
       <application>Meson</application>, and <application>pkg-config</application>;
       the requirements are the same when building from a Git repository clone
       of GLib.

meson.build

@@ -509,7 +509,7 @@ if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
     # building with -Wbad-function-cast.
     '-Wno-cast-function-type',
     # Due to function casts through (void*) we cannot support -Wpedantic:
-    # https://wiki.gnome.org/Projects/GLib/CompilerRequirements#Function_pointer_conversions.
+    # ./docs/toolchain-requirements.md#Function_pointer_conversions.
     '-Wno-pedantic',
     # A zero-length format string shouldn't be considered an issue.
     '-Wno-format-zero-length',