Fix Learning: Cell Executions Not Being Added to BlockLogs

Learning was broken because cell executions were not being properly extracted from LogEvents and added to the BlockLog.
The problem is that the logging of LogEvents happens inside an anonymous function. Therefore the function name generated by GoLang has a suffix like "func1"; therefore our code in the Analyzer was not correctly matching it and therefore log events were not being processed.
The fix is to match by using HasPrefix. This is still brittle.
Per #232 we'd like to start to fix this brittleness by using reflection and source code analysis in unittests to ensure the correctness of matchers for LogEntries.
This PR introduces a matchers package which verifies correctness of the function name but doesn't properly catch the anonymous function which broke learning here
Update the troubleshooting guide for learning
- Move the troubleshooting guide into the docs page
- Update the instructions for fetching the blocklogs; we now use the connect protocol

Strip metadata from markdown

Create a simple tool to strip cell ids from markdown.
This is hack to make it easy to use RunMe markdown docs with Hugo; see stateful/runme#663

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