Fix broken documentation links in README

[VaibhavNarayann]

• Replaced https://docs.plone.org/develop/addons/bobtemplates.plone/docs/
  with https://5.docs.plone.org/develop/addons/bobtemplates.plone/bobtemplates.plone/docs/

• Replaced https://bobtemplatesplone.readthedocs.io/en/latest/
  with https://bobtemplatesplone.readthedocs.io/

These changes ensure users land on working documentation pages.

[mister-roboto]

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