[Developer-portal] Content update

[Pavel Valena]

Hi everyone!

There is a new content update on staging:
 - new subsection: Scientific Python Stack[1]
 - update Ruby On Rails installation commands[2]

Please check the changes for possible errors.

Thank you!

[1] https://developer.stg.fedoraproject.org/tech/languages/python/scipy.html
[2] https://developer.stg.fedoraproject.org/tech/languages/ruby/ror-installation...

(Use the staging website only for review, please.)

Pavel Valena
Associate Software Engineer
Brno, Czech Republic

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