with the creation of https://maven.apache.org/tools/ directory as part of #811

it becomes natural to move Maven Wrapper from https://maven.apache.org/wrapper/ to https://maven.apache.org/tools/wrapper/

this PR does some aspects of smooth transition:

• create symlinks for https://maven.apache.org/tools/wrapper/ and https://maven.apache.org/tools-archives/
• do url redirects
• prepare Component Release Documentation Helper for future releases

just before merging this PR, content in svn website HTML will have to be prepared:

svnmucc -m "move /wrapper to /tools/wrapper (maven-site#838)" \
  -U https://svn.apache.org/repos/asf/maven/website/components \
  mv wrapper-archives tools-archives \
  mkdir tools \
  mv wrapper tools/wrapper

and wrapper site publication can later be changed to point to https://maven.apache.org/tools/wrapper/ (with breadcrumb to tools directory)