Add formatting for Nunjucks files

[rmccar]

What is the context of this PR?

Fixes: ONSdigital/design-team#58

Adds the Jinja plugin (prettier-plugin-jinja-template) to prettier and have then run prettier on all our Nunjucks files to format them correctly. I have also added them to the lint staging step so that they are formatted on the Husky pre commit hook. I have also fixed all errors and warnings from running prettier which has required some refactoring.

Some other fixes have gone in too:

• Removed some component imports in some examples because those components weren't being used.
• Removed the setting of the variants param on the related content component in some examples. This was having no effect because it's hardcoded to "bare" in the macro.

How to review this PR

• Tests pass
• Check through all files checking no unexpected changes have happened, this is the list of components that needed refactoring:
  • address-input
  • autosuggest
  • button
  • card
  • details
  • document-list
  • feedback
  • field
  • footer
  • header
  • input
  • label
  • language-selector
  • list
  • panel
  • section-navigation
  • share-page
  • summary
  • table
  • tabs
• Check no breaking changes have been introduced

Checklist

This needs to be completed by the person raising the PR.

• I have selected the correct Assignee
• I have linked the correct Issue

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[alessioventuriniAND]

I can't find anything wrong. I have tested in locally and run the test command and all have passed. Considering the nmber of changes in the PR is there a way that you can point me in the direction of the components you had to manually change and reformat? I think you also mentioned that you had to rewrite some tests?

[rmccar]

I can't find anything wrong. I have tested in locally and run the test command and all have passed. Considering the nmber of changes in the PR is there a way that you can point me in the direction of the components you had to manually change and reformat? I think you also mentioned that you had to rewrite some tests?

Ive added a list of components that needed refactoring to the description. I haven't touched any tests other than the html snapshot