Add list of previous talks to readme

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.62%. Comparing base (09e4752) to head (8c011b6). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #313 +/- ## ========================================== + Coverage 74.96% 84.62% +9.66% ========================================== Files 41 48 +7 Lines 2552 3362 +810 ========================================== + Hits 1913 2845 +932 + Misses 639 517 -122 ``` | [Flag](https://app.codecov.io/gh/zarr-developers/VirtualiZarr/pull/313/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zarr-developers) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zarr-developers/VirtualiZarr/pull/313/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zarr-developers) | `84.62% <ø> (+9.66%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zarr-developers#carryforward-flags-in-the-pull-request-comment) to find out more.

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