improve doc

CONTRIBUTING.md

@@ -116,12 +116,7 @@ Find the [latest PR](https://github.com/mifi/lossless-cut/pulls) from Weblate an
 
 ## Minimum OS version
 
-Minimum supported OS versions for Electron. As of Electron 35:
-
-- MacOS 11 Big Sur
-- Windows 10
-
-Note that older versions of LosslessCut still work on older operating systems.
+See [requirements](./requirements.md).
 
 ### MacOS [`LSMinimumSystemVersion`](https://developer.apple.com/documentation/bundleresources/information_property_list/lsminimumsystemversion)
 
@@ -139,7 +134,7 @@ cat dist/mas-dev-arm64/LosslessCut.app/Contents/Info.plist
 
 `LSMinimumSystemVersion` can be overridden in `electron-builder` by [`mac.minimumSystemVersion`](https://www.electron.build/configuration/mac.html)
 
-See also `MACOS_MIN` in [ffmpeg-build-script](https://github.com/mifi/ffmpeg-build-script/blob/master/build-ffmpeg).
+See also `MACOSX_DEPLOYMENT_TARGET` in [ffmpeg-build-script](https://github.com/mifi/ffmpeg-build-script/blob/master/build-ffmpeg).
 
 Links:
 - https://support.google.com/chrome/a/answer/7100626
@@ -149,7 +144,7 @@ Links:
 ## Maintainence chores
 
 ### Keep dependencies up to date
-- FFmpeg: [ffmpeg-build-script](https://github.com/mifi/ffmpeg-build-script), [ffmpeg-builds](https://github.com/mifi/ffmpeg-builds)
+- FFmpeg: [ffmpeg-build-script](https://github.com/mifi/ffmpeg-build-script), [ffmpeg-builds](https://github.com/mifi/ffmpeg-builds) and [package.json](./package.json) download scripts.
 - `electron` and upgrade [electron.vite.config.ts](./electron.vite.config.ts) `target`s.
 - `@electron/remote`
 - `package.json` / `yarn.lock`

requirements.md

@@ -1,8 +1,9 @@
 # Supported OS versions
 
-LosslessCut is based on Electron which routinely drops support for old OS versions, and therefore LosslessCut will also do so. [More info](https://github.com/mifi/lossless-cut/discussions/1476#discussioncomment-5012521).
+LosslessCut is based on Electron which routinely drops support for old OS versions, and therefore LosslessCut will also do so. [More info](https://github.com/mifi/lossless-cut/discussions/1476#discussioncomment-5012521). Note that older versions of LosslessCut still work on older operating systems.
 
+- v3.66 [dropped support](https://www.electronjs.org/blog/electron-38-0#removed-macos-11-support) for MacOS 11.
 - v3.58.0 [dropped support](https://www.electronjs.org/docs/latest/breaking-changes#removed-macos-1013--1014-support) for MacOS 10.14 and older.
-- v3.52.0 dropped support for Windows 8.1 and older.
+- v3.52.0 dropped support for [Windows 8.1 and older](https://github.com/mifi/lossless-cut/discussions/1476).
 - v3.48.2 dropped support for MacOS 10.12 and older.
 - v3.48.2 dropped support for 32 bit Linux.