Find Local Council use shared base_page partial

[patrickpatrickpatrick]

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What

Remove the base page for Find Local Council. Find Local Council now uses the shared base_page.

Why

Found this while implementing changes to location forms on frontend. All pages on frontend use a 'base_page' partial but the Find Local Council had a different 'base_page'. It was found that the shared base_page could be used with some small changes to the find_local_council partial.

[chao-xian]

@patrickpatrickpatrick is this still a thing? Can we get it reviewed?

[chao-xian]

Pls attach related PRs and Trello card if so...

[beccapearce]

This PR has been about for a while, going to close it for now since it's not being worked on :)