Since you mentioned maybe trying Sleuth. Dylan just posted a Show HN for our new Accelerate metrics tracker, you can read his comment here: https://news.ycombinator.com/threads?id=detkin
Our co-founder Dylan Etkin wrote this book from a practitioner's perspective. Dylan was one of the first 20 employees at Atlassian, and a founding engineer and the first Architect of Jira. He has also led engineering for Bitbucket at scale, and Statuspage, a startup that Atlassian acquired.
The book attempts to break down HOW elite software teams deploying to production many times a day get to where they are.
Their journey can be deconstructed into 3 phases:
Phase 1 : Deploy once a week
Phase 2 : Deploy once a day
Phase 3 : Deploy a hundred times a day
The book details the measurements, development practices, communications, and cultural milestones that mark each phase to show you how to replicate their journey toward Continuous Delivery - and reap the benefits that come with frequent deployments.
I've just installed Workflowy on my mobile and I didn't like it. First of all, because it's free version is limited to 250 items. Secondly, it's too simple, it doesn't have much options (or at least I didn't find them since I decided to find something without limit).
Browsing the applications on Play Store, I found Orgzly and I think that's going to satisfy my needs.
I'm planning to do this too, and did my own research.
I'm probably going to go with the Launch School (https://launchschool.com/) because of its focus on giving you the foundational skills to learn any language (after learning Ruby from them). I may or may not decide to do the Capstone project.
It seems you're only interested in front-end, not full-stack, so I'm not sure they'd be a fit. But I will say that as a software PM knowing about the back-end is probably useful.
Since you mentioned maybe trying Sleuth. Dylan just posted a Show HN for our new Accelerate metrics tracker, you can read his comment here: https://news.ycombinator.com/threads?id=detkin