[Programs] Add "Back to Programs" button

[leecalcote]

Current Behavior The individual open source internship pages (e.g.https://layer5.io/programs/gsoc/2019) do not have a Back to Programs button to help the user navigate back to the main programs page (https://layer5.io/programs).

Desired Behavior

A back button is present like that of the one on this page - https://layer5.io/community/members/jash-patel

Screenshots / Mockups

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[adithyaakrishna]

@amino19 would you like to try this? 👀

[aminoxix]

Sure Sir! You can assign me for this..

Thanks for asking! : )

[aminoxix]

Done with changes to add Back Button, Pl verify!