Newspapers have concerns when publishing the names and photos of minors arrested for, charged with, or convicted of crimes - but these are ethical concerns more than legal concerns. And the general public is not held to these same ethical standards.
When writing about or posting a picture of an identifiable person, however (whether the person is an adult or a minor), everyone (newspapers and the public alike) needs to be careful how they handle the reputation of that person. There must be care given not to invade the person's privacy or defame the person with a false claim.
A defamation claim can arise if someone is wrongly accused of, or falsely connected with, a crime or crimes they did not commit. Even when someone has been arrested, an arrest is not a charge, and a charge is not a conviction. Until someone is convicted of a crime, they should not be labeled a criminal.
I think that informing neighbors about crimes in the neighborhood can be helpful. It keeps the neighbors alert to anyone or anything suspicious that they see in the area. But I hope you and your neighbors are able to keep to a minimum any gossip about the boy arrested for breaking into your husband's truck. I think you were smart to remove from its location online the photo of the boy and what you wrote about him, as it only works to feed the gossip.
With that said, I think there is little likelihood that what you posted online will cause any legal issue for you. If it does, you will want to speak to an attorney in your area.