Remove the PaaS and Dodas docs. Move ec3 under IM

[enolfc]

Summary

As EGI-ACE is over we keep the docs for the services in the EGI portfolio. EC3 moves into IM and the portal for EC3 is removed as it is to be deprecated.

---

Related issue : #611

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/612

[github-actions[bot]]

@check-spelling-bot Report

:red_circle: Please review

See the :open_file_folder: files view, the :scroll:action log, or :memo: job summary for details.

:x: Errors	Count
:x: dictionary-not-found	12
:information_source: non-alpha-in-dictionary	3

See :x: Event descriptions for more information.

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/612

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/612

[gwarf]

@glarocca, @enolfc should we just merge this now?

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/612

[gwarf]

@glarocca please approve this PR so that we can merge it. Or please let me know if you shouldn't be an automatically assigned reviewer for this part of the documentation.

[github-actions[bot]]

Documentation preview deployed!

Available at https://docs.egi.eu/documentation/612