README: attempt to be more concise, using gh "details" feature

README.md

@@ -41,6 +41,37 @@ Optional dependencies:
 - [Wine](https://www.winehq.org/) to build Windows apps from non-Windows platforms.
   Be sure `wine` is in your `$PATH`.
 
+<details>
+  <summary>Nativefier is also installable with Docker (click to expand)</summary>
+
+  - Pull the image from [Docker Hub](https://hub.docker.com/r/nativefier/nativefier): `docker pull nativefier/nativefier`
+  - ... or build it yourself: `docker build -t local/nativefier .`
+    (in this case, replace `nativefier/` in the below examples with `local/`)
+
+  By default, `nativefier --help` will be executed.
+  To build e.g. a Gmail app into `~/nativefier-apps`,
+
+  ```bash
+  docker run --rm -v ~/nativefier-apps:/target/ nativefier/nativefier https://mail.google.com/ /target/
+  ```
+
+  You can pass Nativefier flags, and mount volumes to pass local files. E.g. to use an icon,
+
+  ```bash
+  docker run --rm -v ~/my-icons-folder/:/src -v $TARGET-PATH:/target nativefier/nativefier --icon /src/icon.png --name whatsApp -p linux -a x64 https://web.whatsapp.com/ /target/
+  ```
+</details>
+
+<details>
+  <summary>Nativefier is also installable from Snap & AUR (click to expand)</summary>
+
+  These repos are *not* managed by Nativefier maintainers; use at your own risk.
+  If using them, for your security, please inspect the build script.
+
+  - [Snap](https://snapcraft.io/nativefier)
+  - [AUR](https://aur.archlinux.org/packages/nodejs-nativefier)
+</details>
+
 ## Usage
 
 To create a desktop app for medium.com, simply `nativefier 'medium.com'`
@@ -55,39 +86,10 @@ to learn about command-line flags usable to configure your app.
 To have high-quality icons used by default for an app/domain, please
 contribute to the [icon repository](https://github.com/nativefier/nativefier-icons).
 
-### Catalog
+### Troubleshooting
 
-See [CATALOG.md](CATALOG.md) for build commands & workarounds contributed by the community.
+See [CATALOG.md](CATALOG.md) for site-specific ideas & workarounds contributed by the
-
+community, and search in [existing issues](https://github.com/nativefier/nativefier/issues).
-## Docker
-
-Nativefier is also usable from Docker:
-
-- Pull the image from [Docker Hub](https://hub.docker.com/r/nativefier/nativefier): `docker pull nativefier/nativefier`
-- ... or build it yourself: `docker build -t local/nativefier .`
-  (in this case, replace `nativefier/` in the below examples with `local/`)
-
-By default, `nativefier --help` will be executed.
-To build e.g. a Gmail app into `~/nativefier-apps`,
-
-```bash
-docker run --rm -v ~/nativefier-apps:/target/ nativefier/nativefier https://mail.google.com/ /target/
-```
-
-You can pass Nativefier flags, and mount volumes to pass local files. E.g. to use an icon,
-
-```bash
-docker run --rm -v ~/my-icons-folder/:/src -v $TARGET-PATH:/target nativefier/nativefier --icon /src/icon.png --name whatsApp -p linux -a x64 https://web.whatsapp.com/ /target/
-```
-
-## Unofficial repositories
-
-Nativefier is also available in various user-contributed software repos.
-These are *not* managed by Nativefier maintainers; use at your own risk.
-If using them, for your security, please inspect the build script.
-
-- [Snap](https://snapcraft.io/nativefier)
-- [AUR](https://aur.archlinux.org/packages/nodejs-nativefier)
 
 ## Development
 
@@ -97,31 +99,4 @@ Help welcome on [bugs](https://github.com/nativefier/nativefier/issues?q=is%3Aop
 Docs: [Developer / build / hacking](HACKING.md), [API / flags](API.md),
 [Changelog](CHANGELOG.md).
 
-## License
+License: [MIT](LICENSE.md).
-
-[MIT](LICENSE.md).
-
-## Troubleshooting
-
-Generally, see [CATALOG.md](CATALOG.md) for ideas & workarounds, and search in
-[existing issues](https://github.com/nativefier/nativefier/issues).
-
-### Old/unsupported browser
-
-Some sites intentionally block Nativefier (or similar) apps, e.g. [Google](https://github.com/nativefier/nativefier/issues/831) and [WhatsApp](https://github.com/nativefier/nativefier/issues/1112).
-
-First, try setting the [`--user-agent`](https://github.com/nativefier/nativefier/blob/master/API.md#user-agent) to `firefox` or `safari`.
-If still broken, see [CATALOG.md](CATALOG.md) + existing issues.
-
-### Videos won't play
-
-This issue comes up for certain sites like [HBO Max](https://github.com/nativefier/nativefier/issues/1153) and [Udemy](https://github.com/nativefier/nativefier/issues/1147).
-
-First, try [`--widevine`](API.md#widevine).
-If still broken, see [CATALOG.md](CATALOG.md) + existing issues.
-
-### Settings cached between app rebuilds
-
-This can occur because app cache lives separate from the app.
-
-Try delete your app's cache, which is found at `<your_app_name_lower_case>-nativefier-<random_id>` in your OS's "App Data" directory (for Linux: `$XDG_CONFIG_HOME` or `~/.config` , for MacOS: `~/Library/Application Support/` , for Windows: `%APPDATA%` or `C:\Users\yourprofile\AppData\Roaming`)