Revise and clean up some icons (#35582)

This is really just a small beginning, as there are many other icons to
be revised and cleaned up. Our current set is a bit of a mess in terms
of dimension, spacing, stroke width, and terminology. I'm sure there are
more non-used icons I'm not covering here, too. We'll hopefully tackle
it all soon leading up to 1.0.

Closes https://github.com/zed-industries/zed/issues/35576

Release Notes:

- N/A

crates/recent_projects/src/remote_servers.rs

@@ -963,7 +963,7 @@ impl RemoteServerProjects {
                                 .child({
                                     let project = project.clone();
                                     // Right-margin to offset it from the Scrollbar
-                                    IconButton::new("remove-remote-project", IconName::TrashAlt)
+                                    IconButton::new("remove-remote-project", IconName::Trash)
                                         .icon_size(IconSize::Small)
                                         .shape(IconButtonShape::Square)
                                         .size(ButtonSize::Large)