WIP: start writing migration guide

appendices/migration84.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<appendix xml:id="migration84" xmlns="http://docbook.org/ns/docbook">
+ <title>Migrating from PHP 8.3.x to PHP 8.4.x</title>
+
+ <para>
+  This new minor version brings with it a number of
+  <link linkend="migration84.new-features">new features</link> and a
+  <link linkend="migration84.incompatible">few incompatibilities</link>
+  that should be tested for before switching PHP versions in production
+  environments.
+ </para>
+
+ <para>
+  &manual.migration.seealso;
+  <link linkend="migration71">7.1.x</link>,
+  <link linkend="migration72">7.2.x</link>,
+  <link linkend="migration73">7.3.x</link>,
+  <link linkend="migration74">7.4.x</link>,
+  <link linkend="migration80">8.0.x</link>,
+  <link linkend="migration81">8.1.x</link>,
+  <link linkend="migration82">8.2.x</link>,
+  <link linkend="migration82">8.3.x</link>.
+ </para>
+
+ &appendices.migration84.new-features;
+ &appendices.migration84.new-classes;
+ &appendices.migration84.new-functions;
+ &appendices.migration84.constants;
+ &appendices.migration84.incompatible;
+ &appendices.migration84.deprecated;
+ &appendices.migration74.removed-extensions;
+ &appendices.migration84.other-changes;
+ &appendices.migration84.windows-support;
+
+</appendix>
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