Add a search button or search box to blogs. Most likely, make it optional.
[Also tracked publicly](https://trello.com/c/5bEdFLXp/72-search-blog-posts).
[Bruno de Souza](mailto:firstname.lastname@example.org) said:
> Do you have a prevision when will make a search button, or a list with all the tags of the blog?
> I’m thinking when I have 10000 posts. How will I search a specific tag? I know that there is #hashtag, but will be interesting if have a search button, or a space that show all the tags.
This is also required by Ploum and requested by Gina, [aris](https://discuss.write.as/t/crucial-features-for-v1-0/229/15?u=matt), and [bugbuster](https://discuss.write.as/t/crucial-features-for-v1-0/229/16?u=matt).