M365D tutorials and tools (#3186)
* M365D tutorials and tools
Added webcasts and pbi to the right folders in Sentinel repo
* Update Episode 1 - KQL Fundamentals.txt
* Update Episode 2 - Joins.txt
removed en-us from links
* Update Episode 4 - Lets Hunt.txt
removed en-us from links
* Update MCAS - The Hunt.txt
removed links with en-us
* Update Performance, Json and dynamics operator, external data.txt
removed en-us from links
* Update MCAS - The Hunt.txt
removed en-us
* Update Airlift 2021 - Lets Invoke.csl
removed en-us
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