docs: remove DEV_SESSIONS list (#5579)

docs/DEV_SESSIONS.md

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-order: 1
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-
-# Developer Sessions
-
-The Tendermint Core developer call is comprised of both [Interchain
-Foundation](http://interchain.io/) and [All in Bits](https://tendermint.com/)
-team members discussing the development of [Tendermint
-BFT](https://github.com/tendermint/tendermint) and related research. The goal
-of the Tendermint Core developer calls is to provide transparency into the
-decision making process, technical information, update cycles etc.
-
-## List
-
-| Date           | Topic                                                       | Link(s)                                                                                                      |
-| -------------- | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ |
-| October 2019   | ABCI Overview (2/2)                                         | [Youtube](https://www.youtube.com/watch?v=K3-E5wj2jA8)                                                       |
-| October 2019   | ABCI Overview (1/2)                                         | [YouTube](https://www.youtube.com/watch?v=I3OnA8yCHl4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)               |
-| September 2019 | IAVL+ Presentation                                          | [YouTube](https://www.youtube.com/watch?v=e5wwBaCTc9Y&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)       |
-| September 2019 | Tendermint Dev Session - Blockchain Reactor in TLA+         | [YouTube](https://www.youtube.com/watch?v=q0e0pEQ5aiY&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=3)       |
-| September 2019 | Tendermint Code Review - SkipTimeoutCommit & Block Rollback | [YouTube](https://www.youtube.com/watch?v=MCo_oH7rys8&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
-| September 2019 | Tendermint Evidence Handling                                | [YouTube](https://www.youtube.com/watch?v=-4H3_DVlYRk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
-| August 2019    | Part Three: Tendermint Lite Client                          | [YouTube](https://www.youtube.com/watch?v=whyL6UrKe7I&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
-| August 2019    | Fork Accountability                                         | [YouTube](https://www.youtube.com/watch?v=Jph-4PGtdPo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
-| July 2019      | Part Two: Tendermint Lite Client                            | [YouTube](https://www.youtube.com/watch?v=gTjG7jNNdKQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)       |
-| July 2019      | Part One: Tendermint Lite Client                            | [YouTube](https://www.youtube.com/watch?v=C6fH_sgPJzA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)       |
-| June 2019      | Testnet Deployments                                         | [YouTube](https://www.youtube.com/watch?v=gYA6no7tRlM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)      |
-| June 2019      | Blockchain Reactor Refactor                                 | [YouTube](https://www.youtube.com/watch?v=JLBGH8yxABk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)      |
-| June 2019      | Tendermint Rust Libraries                                   | [YouTube](https://www.youtube.com/watch?v=-WXKdyoGHwA&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)       |
-| May 2019       | Merkle Tree Deep Dive                                       | [YouTube](https://www.youtube.com/watch?v=L3bt2Uw8ICg&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)       |
-| May 2019       | Remote Signer Refactor                                      | [YouTube](https://www.youtube.com/watch?v=eUyXXEEuBzQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=12)      |
-| May 2019       | Introduction to Ansible                                     | [YouTube](https://www.youtube.com/watch?v=72clQLjzPg4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=14&t=0s) |
-| April 2019     | Tendermint State Sync Design Discussion                     | [YouTube](https://www.youtube.com/watch?v=4k23j2QHwrM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=11)      |
-| April 2019     | ADR-036 - Blockchain Reactor Refactor                       | [YouTube](https://www.youtube.com/watch?v=TW2xC1LwEkE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=10)      |
-| April 2019     | Verifying Distributed Algorithms                            | [YouTube](https://www.youtube.com/watch?v=tMd4lgPVBxE&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=9)       |
-| April 2019     | Byzantine Model Checker Presentation                        | [YouTube](https://www.youtube.com/watch?v=rdXl4VCQyow&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=8)       |
-| January 2019   | Proposer Selection in Idris                                 | [YouTube](https://www.youtube.com/watch?v=hWZdc9c1aH8&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=7)       |
-| January 2019   | Current Mempool Design                                      | [YouTube](https://www.youtube.com/watch?v=--iGIYYiLu4&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=6)       |
-| December 2018  | ABCI Proxy App                                              | [YouTube](https://www.youtube.com/watch?v=s6sQ2HOVHdo&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=5)       |
-| October 2018   | DB Performance                                              | [YouTube](https://www.youtube.com/watch?v=jVSNHi4l0fQ&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=4)       |
-| October 2018   | Alternative Mempool Algorithms                              | [YouTube](https://www.youtube.com/watch?v=XxH5ZtM4vMM&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv&index=2)       |
-| October 2018   | Tendermint Termination                                      | [YouTube](https://www.youtube.com/watch?v=YBZjecfjeIk&list=PLdQIb0qr3pnBbG5ZG-0gr3zM86_s8Rpqv)               |