I have been using Jekyll and a Jekyll theme for my blog hosted on GitHub Pages. I haven't blogged in a few months, and today, before pushing to GitHub, I ran
Deprecation: The 'include' configuration option must now be specified as an array, but you specified a string. For now, we've treated the string you provided as a list of comma-separated values.
Error: could not read file /Users/JakeWengroff/blog/pages/_posts/2016-07-28-blog-title.md: (<unknown>): mapping values are not allowed in this context at line 5 column 71
For your first error:
In your config file, change
include: - _portfolio
And for your second error, change this line, from:
summary: Data scientists do not usually create their own algorithms: what a relief.
summary: "Data scientists do not usually create their own algorithms: what a relief."
Note that I just put the line in quotes because you've got a colon in the value, which Jekyll uses to differentiate between keys and values in front matter.