linkcheck: Fix broken and redirected links

Author: rffontenelle

source/builder.txt

@@ -124,7 +124,7 @@ The final code of the example
 Gtk.Template
 ------------
 :class:`Gtk.WidgetClass` allows UI definition files to be used to extend a widget,
-PyGObject provides :doc:`guide/gtk_template` as a way of accessing this from Python.
+PyGObject provides :doc:`pygobject:guide/gtk_template` as a way of accessing this from Python.
 
 The UI definition file used in the example needs a small change to include a *<template>* element:
 
@@ -136,4 +136,4 @@ Then it can be used to implement the example with a :class:`Gtk.Window` subclass
 .. literalinclude:: ../examples/template_example.py
     :linenos:
 
-More information can be found at the `PyGObject <https://pygobject.readthedocs.io/en/latest/guide/gtk_template.html>`_ website.
+More information can be found at the `PyGObject <https://pygobject.gnome.org/guide/gtk_template.html>`_ website.

source/index.txt

@@ -24,7 +24,7 @@ lists and tuples will be needed.
 
 Although this tutorial describes the most important classes and methods within
 GTK+ 3, it is not supposed to serve as an API reference. Please refer to the
-`GTK+ 3 Reference Manual <https://developer.gnome.org/gtk3/stable/>`_ for a
+`GTK+ 3 Reference Manual <https://docs.gtk.org/gtk3/>`_ for a
 detailed description of the API. Also there's a `Python-specific reference
 <https://lazka.github.io/pgi-docs/>`_ available.
 

source/menus.txt

@@ -59,7 +59,7 @@ UI Manager
 ----------
 
 :class:`Gtk.UIManager` provides an easy way of creating menus and toolbars using
-an `XML-like description <https://developer.gnome.org/gtk3/stable/GtkUIManager.html#XML-UI>`_.
+an `XML-like description <https://docs.gtk.org/gtk3/class.UIManager.html#ui-definitions-xml-ui>`_.
 
 First of all, you should add the :class:`Gtk.ActionGroup` to the UI Manager with
 :meth:`Gtk.UIManager.insert_action_group`. At this point is also a good idea to