Add adblock package from OpenWRT repo for less powerful devices

Technical Support for Routers
1

Hi

Add adblock package from OpenWRT repo for less powerful devices. You can make SD usagemandatory to use this feature if space is issue.

Because some routers doesn't support ADGH which is a pain. This should be resource efficient solution

@alzhao please take a look (on reddit I sent to exactly you)

2

People was talking about Adblock a lot. But we don't think we will work on this recently.

BTW my reddit account is disabled for no reason and will not be used anymore.