Remove the "can't copy/cut on Safari" warning from the Getting Starte…

…d guides (#4300)

### What

egui 0.24 will fix the bug where coping from Safari was impossible:
- emilk/egui#3513

This PR removes the related warnings in the in-app Getting Started
guides.

- May be blocked by
lampsitter/egui_commonmark#21??
- Blocked by #4111
- Fixes #4292

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/4300) (if
applicable)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG

- [PR Build Summary](https://build.rerun.io/pr/4300)
- [Docs
preview](https://rerun.io/preview/0a0e58f6c169798c01d1932ecec3fb51cfe6360e/docs)
<!--DOCS-PREVIEW-->
- [Examples
preview](https://rerun.io/preview/0a0e58f6c169798c01d1932ecec3fb51cfe6360e/examples)
<!--EXAMPLES-PREVIEW-->
- [Recent benchmark results](https://build.rerun.io/graphs/crates.html)
- [Wasm size tracking](https://build.rerun.io/graphs/sizes.html)

crates/re_viewer/data/quick_start_guides/cpp_connect.md

@@ -1,7 +1,5 @@
 # C++ Quick Start
 
-${SAFARI_WARNING}
-
 ## Installing the Rerun viewer
 The Rerun C++ SDK works by connecting to an awaiting Rerun Viewer over TCP.
 

crates/re_viewer/data/quick_start_guides/python_connect.md

@@ -1,7 +1,5 @@
 # Python Quick Start
 
-${SAFARI_WARNING}
-
 ## Installing the Rerun SDK
 
 The Rerun SDK is available on [PyPI](https://pypi.org/) under the

crates/re_viewer/data/quick_start_guides/python_spawn.md

@@ -1,7 +1,5 @@
 # Python Quick Start
 
-${SAFARI_WARNING}
-
 ## Installing the Rerun SDK
 
 The Rerun SDK is available on [PyPI](https://pypi.org/) under the

crates/re_viewer/data/quick_start_guides/rust_connect.md

@@ -1,7 +1,5 @@
 # Rust Quick Start
 
-${SAFARI_WARNING}
-
 ## Installing Rerun
 
 To use the Rerun SDK in your project, you need the [rerun crate](https://crates.io/crates/rerun) which you can add with `cargo add rerun`.

crates/re_viewer/data/quick_start_guides/rust_spawn.md

@@ -1,7 +1,5 @@
 # Rust Quick Start
 
-${SAFARI_WARNING}
-
 ## Installing Rerun
 
 After you have [installed the viewer](https://www.rerun.io/docs/getting-started/installing-viewer) you can simply add [the rerun crate](https://crates.io/crates/rerun) to your project with `cargo add rerun`.

crates/re_viewer/src/ui/welcome_screen/welcome_page.rs

@@ -101,7 +101,6 @@ fn onboarding_content_ui(
                         [
                             ("EXAMPLE_CODE", code),
                             ("HOW_DOES_IT_WORK", HOW_DOES_IT_WORK_MARKDOWN),
-                            ("SAFARI_WARNING", safari_warning()),
                         ]
                         .into(),
                         "C++ Quick Start",
@@ -121,7 +120,6 @@ fn onboarding_content_ui(
                         [
                             ("EXAMPLE_CODE", code),
                             ("HOW_DOES_IT_WORK", HOW_DOES_IT_WORK_MARKDOWN),
-                            ("SAFARI_WARNING", safari_warning()),
                         ]
                         .into(),
                         "Python Quick Start",
@@ -141,7 +139,6 @@ fn onboarding_content_ui(
                         [
                             ("EXAMPLE_CODE", code),
                             ("HOW_DOES_IT_WORK", HOW_DOES_IT_WORK_MARKDOWN),
-                            ("SAFARI_WARNING", safari_warning()),
                         ]
                         .into(),
                         "Rust Quick Start",
@@ -371,35 +368,3 @@ fn open_markdown_recording(
 
     Ok(())
 }
-
-/// The User-Agent of the user's browser.
-fn user_agent() -> Option<String> {
-    #[cfg(target_arch = "wasm32")]
-    return eframe::web::user_agent();
-
-    #[cfg(not(target_arch = "wasm32"))]
-    None
-}
-
-/// Are we running on Safari?
-fn safari_warning() -> &'static str {
-    // Note that this implementation is very naive and might return false positives. This is ok for
-    // the purpose of displaying a "can't copy" warning in the Quick Start guide, but this detection
-    // is likely not suitable for pretty much anything else.
-    //
-    // See this page for more information on User Agent sniffing (and why/how to avoid it):
-    // https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent
-
-    let is_safari = user_agent().is_some_and(|user_agent| {
-        user_agent.contains("Safari")
-            && !user_agent.contains("Chrome")
-            && !user_agent.contains("Chromium")
-    });
-
-    if is_safari {
-        "**Note**: This browser appears to be Safari. If you are unable to copy the code, please \
-        try a different browser (see [this issue](https://github.com/emilk/egui/issues/3480))."
-    } else {
-        ""
-    }
-}