Sanitize HTML in Event Descriptions

[ThorntonMatthewD]

WIP

Adds the mews/purifier package as a depdency and utilizes it to sanitize HTML contained in event descriptions prior to persisting them.

[bogdankharchenko]

Looks good!

[allella]

@ThorntonMatthewD is there a configuration file that's being set for this package? If so, would we want to add something to the .env.example or some other place so we know what the config should look like?

[ThorntonMatthewD]

@allella So far I've just been tinkering with the default config that the package ships with. We could specify a custom config at config/purifier.php if the need arises, but I've not done enough testing to determine if that is something that should be pursued.

[allella]

Sounds good.

[bogdankharchenko]

@ThorntonMatthewD let's get this merged in

[bogdankharchenko]

@ThorntonMatthewD Can we get this merged in? =)

[allella]

@bogdankharchenko did we address this in another way?

The HTML in the Slackbot in #events does some goofy stuff, but that's perhaps a problem to be solved in that repo.

[bogdankharchenko]

I will solve it another way