Implement custom webform css setting

https://netnode.atlassian.net/jira/software/c/projects/RP/boards/321?assignee=6310d13d3e578bb3b5fec34e&selectedIssue=SOL-372

requested review from @lukas.fischer and @nkoporec

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• 80964d70 - Fix example url

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• 172ab87f - Remove test html attribute

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• 05b60012 - Fix syntax error

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• da3c48b4 - Fix route check

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• ddce8165 - Use default css from theme as well

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merged