Fix Learning: Cell Executions Not Being Added to BlockLogs

[jlewi]

• 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 Fix Brittleness In Logs Processing With Source Detection #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 RunMe CellIDs Don't Play Well With Hugo stateful/runme#663

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