* fix: use clang and libcxx from chromium
* chore: add flags for Link-Time Optimization
libcxx builds from upstream are built with LTO, avoiding these
flags will cause miscompiles
* chore: add lto flags to compilation units
* Use shared webpack version instead of installing locally for simple-browser
* Use npm for building markdown preview
* render markdown in webview.
* update markdown preview height and offset
* Add basic custom notebook renderer point
* update css
* style update.
* update markdown header padding left
* Add example of loading katex to extend the markdown-it renderer
* Rename global to make clear it only applies to markdown-in
* hide/remove markdown preview
* Add wait for initial markdown preview rendering before showing notebook
* Add double click to switch to editing mode
* Fix markdown cells not getting updated after editing
* style polish
* notebook.experimental.useMarkdownRenderer
* switch render strategy.
* Adding very intial drag drop support for notebook markdown cells
* Implement drag/drop stubs for test classes
* Revert unrelated file changes
* Move markdown notebook math to own extension
* Add missing imports
Co-authored-by: rebornix <penn.lv@gmail.com>
