Add Data Request button on openafrica home page.

[andela-onnenanya]

Currently:

When you install ckanext-datarequest on your ckan instance, it shows the button for DATAREQUEST. But once ckanext-openafrica is installed, the button is overridden.
Navigating to /datarequest show the page for requesting for dataset but the button is missing on the home page. see https://africaopendata.org/datarequest

Desired Behaviour:

A user should be able to see the datarequest button on the home page, which when clicked, should navigate to /datarequest.

Why This Issue is Important:

Without the button, the user may not have any clue that datasets can be requested for. Moreover, a user who is aware of datarequest will not have to type /datarequest but can easily navigate to the page by clicking on the button.

Notes:

• This issue can easily be handled by replicating the Suggest a dataset button shown at the bottom when no dataset is found for a user's search.
• Since ckanext-datarequest adds the button, it seems like a bug when the button does not appear after installing ckanext-openafrica

Let's also ensure there is a way to check if data requests extension is activated before it shows the link to avoid 404 in a case where it isn't
by @DavidLemayian

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[andela-onnenanya]

I'm currently working on this issue

[andela-onnenanya]

I have raised the PR.
I also ensured that the user must be logged in for the button to be visible.