Feat/party pages initial

[Bekabyx]

The first public-facing change of the party pages overhaul 😁 Trello.

Ref #1200

The page at this point is pretty basic. This PR aims to:

• Remove that horrible candidates list which used to be present on the page
• Add text to indicate deregistered parties
• Add text to indicate joint parties
• Add links to the relevant page(s) on the EC's party register

To test locally:

• Ensure you're up to date with migrations and you've run python manage.py import_parties. This changed in my previous PR so you may already be up to date, but I thought I'd mention it to stay on the safe side 😄
• Run the project

Case 1: Just a standard active party

• Load up the party page of any party who is not deregistered, joint, indie or speaker (e.g. /parties/party:804/trade-unionist-and-socialist-coalition)
• It should look something like this:

- Check the EC link goes to the correct party register page in English - Change the party page language to Welsh - Check the EC link goes to the correct party register page in Welsh

Case 2: Joint party

• Load up the party page of any joint party (e.g. /parties/joint-party:53-119/labour-and-co-operative-party
• It should look something like this:

Case 3: Deregistered party

• Load up the party page of any de-registered party (e.g. /parties/party:2802/abolish-the-welsh-assembly-party)
• It should look something like this:

Tasks

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1. References a specific issue or if not, describes the bug or feature in detail
2. Note what card in Trello this work relates to
3. Instructions for how reviewers can test the code locally
4. Tests have been added and/or updated
5. Screenshot of the feature/bug fix (if applicable)
6. If any new text is added, it's internationalized
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9. Added any comments to make new functions clearer

[coveralls]

Coverage: 58.149% (+0.4%) from 57.787% when pulling 5f59296 on feat/party-pages-initial into e4ce247 on master.

[coveralls]

Coverage: 58.149% (+0.4%) from 57.787% when pulling 33840bc on feat/party-pages-initial into e4ce247 on master.

[coveralls]

Coverage: 58.149% (+0.4%) from 57.787% when pulling 33840bc on feat/party-pages-initial into e4ce247 on master.

[coveralls]

Coverage: 58.149% (+0.4%) from 57.787% when pulling f5676cc on feat/party-pages-initial into 2d1299a on master.

[symroe]

This and below: I'm not sure this empty div is doing anything?

[Bekabyx]

You're right. I put these in divs earlier to get the ds-stack rules to feed through but now the page format is properly sorted they've become redundant. Will remove in the next commit :)

[symroe]

One minor point about divs, but this looks decent to me 👍