v1.0.0 update readme

Let's make it version 1, it's now stable enough.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ratatui-image"
-version = "0.10.0"
+version = "1.0.0"
 edition = "2021"
 autoexamples = true
 authors = ["Benjamin Große <ste3ls@gmail.com>"]

Makefile.toml

@@ -20,6 +20,7 @@ dependencies = [
   "test",
   "readme",
   "build",
+  "screenshot-ci",
 ]
 
 [tasks.fmt]

README.md

@@ -110,18 +110,17 @@ blocking the UI thread.
 The lib also includes a binary that renders an image file.
 
 ## Features
+* `sixel` (default) compiles with libsixel.
 * `rustix` (default) enables much better guessing of graphics protocols with `rustix::termios::tcgetattr`.
-* `crossterm` or `termion` should match your ratatui backend. `termwiz` is available, but does not
-work correctly with ratatu-image.
+* `crossterm` or `termion` should match your ratatui backend. `termwiz` is available, but not
+working correctly with ratatu-image.
 * `serde` for `#[derive]`s on [picker::ProtocolType] for convenience, because it might be
 useful to save it in some user configuration.
 * `image-defaults` (default) just enables `image/defaults` (`image` has `default-features =
 false`). To only support a selection of image formats and cut down dependencies, disable this
 feature, add `image` to your crate, and enable its features/formats as desired. See
 https://doc.rust-lang.org/cargo/reference/features.html#feature-unification.
 
-The sixel implementation is now native: [icy_sixel](https://github.com/mkrueger/icy_sixel).
-
 [Ratatui]: https://github.com/ratatui-org/ratatui
 [Sixel]: https://en.wikipedia.org/wiki/Sixel
 [`render_stateful_widget`]: https://docs.rs/ratatui/latest/ratatui/terminal/struct.Frame.html#method.render_stateful_widget
@@ -132,7 +131,7 @@ Compatibility and QA:
 
 Terminal  | Protocol | Fixed | Resize | Notes
 ----------|----------|-------|--------|-------
-Xterm     | `Sixel`  | ✔️     | ✔️      | Run with `-ti 340` to make sure sixel support is enabled. [Latest Xvfb test screenshot](./assets/screenshot_xterm.png).
+Xterm     | `Sixel`  | ✔️     | ✔️      | Run with `-ti 340` to make sure sixel support is enabled.
 Foot      | `Sixel`  | ✔️     | ✔️      | Wayland.
 kitty     | `Kitty`  | ✔️     | ✔️      |
 Wezterm   | `iTerm2` | ✔️     | ✔️      | Also would support `Sixel` and `Kitty`, but only `iTerm2` actually works bug-free.
@@ -145,8 +144,6 @@ Blackbox  | `Sixel`  | ❔    | ❔     | Untested.
 
 Here, "Fixed" means the `Image` widget, and "Resize" is the `StatefulWidget`.
 
-A basic screenshot test is run with xterm on Xvfb in the CI (or `cargo make screenshot-xvfb && cargo make screenshot-diff`).
-
 Halfblocks should work in all terminals.
 
 ### Comparison: