* Adding new theme Hall from @henriqueiamarino
* Removed 'theme' attribute
* Removed 'ref' attributes from navigation
* Removed unused pattern
* Cleaned up theme.json file (saved via CBT)
* Set version to 1.0.0
* Fixed Header templates to use Site Title instead of Header. Styled Site Title to match Header block that was removed.
* Updates from latest zip
* Update image refs in readme
* Add strict_types
* Patternise 404 and home templates
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Co-authored-by: Sarah Norris <sarah@sekai.co.uk>
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