[TASK] Move rest link chapters on separate pages (#452)

Documentation/Reference/ReStructuredText/Links/Anchors.rst

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+:navigation-title: Anchors
+..  include:: /Includes.rst.txt
+
+..  index:: reST; Link targets
+..  _link-anchor:
+..  _link-targets-explanation:
+..  _explicit-link-targets:
+
+============
+Link anchors
+============
+
+Link anchors assign a unique name to a headline and its section. These anchors
+can be used in internal references and references between TYPO3 manuals.
+
+As long as the anchor of a section stays the same the section can be moved to
+another page or the headline can be renamed and references will still go to the
+correct target.
+
+You can define a link anchor with a label for a section.
+
+In the following example, the link target :rst:`columns-inline` is assigned
+to the section with the title "Inline columns".
+
+Place the link anchor definition directly before the section header:
+
+..  code-block:: rst
+
+    ..  _inline-columns:
+
+    Inline columns
+    ==============
+
+Link anchors should contain alphanumeric signs plus hyphen: (`[a-z][0-9][-]`).
+All other signs are automatically transformed by the symfony
+:php:`Symfony\Component\String\Slugger\AsciiSlugger`.
+
+A recommended recipe could be:
+
+#.  Duplicate the headline
+#.  Transform to lowercase
+#.  Replace all blanks by a hyphens `-`
+#.  Remove all non-alphanumeric characters or replace them by a hyphen `-`
+#.  Add `.. _` at the beginning.
+#.  Add `:` at the end.
+
+We are currently trying to let `Fractor support <https://github.com/andreaswolf/fractor/issues/206>`
+this and other transformations.

Documentation/Reference/ReStructuredText/Links/Composer.rst

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+:navigation-title: Composer / Extensions
+..  include:: /Includes.rst.txt
+
+..  _linking-extensions:
+
+==============================================
+Linking Composer packages and TYPO3 extensions
+==============================================
+
+You can use the text role :rst:`:composer:` to create an infobox with information
+and links to Packagist. This way you can link to any TYPO3 extension
+that is also listed on Packagist like :composer:`georgringer/news` and
+:composer:`b13/container`, any TYPO3 system extension like
+:composer:`typo3/cms-adminpanel` and any other Composer package like
+:composer:`typo3/testing-framework`:
+
+..  code-block:: rst
+
+    This way you can link to any TYPO3 extension
+    that is also listed on packagist like :composer:`georgringer/news` and
+    :composer:`b13/container`, any TYPO3 system extension like
+    :composer:`typo3/cms-adminpanel` and any other Composer package like
+    :composer:`typo3/testing-framework`
+
+If you want to link to the TYPO3 Extension Repository (TER) you can use the
+text role :rst:`t3ext` instead and link extensions like :t3ext:`news` or
+system extensions like :t3ext:`adminpanel`:
+
+..  code-block:: rst
+
+    You can use the text role `t3ext` instead and link extensions like
+    :t3ext:`news` or system extensions like :t3ext:`adminpanel`