Allow more structured data script tag types

[mtorromeo]

To fix #46 a simple logic was applied to SearchHTMLBody to only allow script tags if they contained the string application/ld+json but there are other structured data scripts that are not harmful.

One such script is application/json+trustpilot (see https://help.trustpilot.com/s/article/Add-a-structured-data-snippet-for-Automatic-Feedback-Service?language=en_US)

I modified the logic to allow a more generic type pattern of application/*+json and application/json+*. The code also looks for the string type="..." as this prevents scripts like <script type="application/javascript" whatever="application/ld+json"> to bypass the filter.

IMHO this would be better implemented as a configurable pattern, but as a simple alternative this should be flexible enough for now.

Another alternative would be to only block script tags where the type attribute is either missing or one of application/javascript or text/javascript since these are in theory the only potentially dangerous types. This would work better against a script written like this: <script type="application/javascript" type="application/ld+json"> which would still be included in the email.