Fix documentation

[cvvergara]

Fixes

• migration documentation
  • reorganization of migration document. Keeping focus only on GSoC work (see image bellow)
  • Change examples to old/new documentation examples so that it is easier to see what is happening
• Licenses: some names were removed some new names were missing
• release notes & NEWS
  • Rewording in the availability section of the functions

Minor code changes

• Standardizing error message when for the invalid driving side.

Other:

• Change the way to write the history by using include sphinx command to include the text in availability of the functions
  • notes2news changes to get the information from the text in availability section of the functions
• Removal of trailing spaces

@pgRouting/admins

[robe2]

Why are we using markdown syntax for links? I thought rst has to be like https://sublime-and-sphinx-guide.readthedocs.io/en/latest/references.html#links-to-external-web-pages

[robe2]

ah nvermind I was looking at the NEWS which is md isntead of the rst files.