feat(deadlines): add routes, in navigation and on dashboard, controller and views

[donni106]

These are the first steps to implement the whole "deadlines" feature to manage fix dates with several push notification possibilities.

SVA-710

index	new/edit

[codeclimate[bot]]

Code Climate has analyzed commit 5a44a147 and detected 41 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	30
Duplication	7
Security	1
Style	3

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