Add additional notes for 0.5.4 (#15)

additional_notes/0.5.4/header.md

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+
+*Friday, Sep 27, 2024*
+
+We’re happy to announce the release of napari 0.5.4!
+
+napari is a fast, interactive, multi-dimensional image viewer for Python. It’s designed for exploring, annotating, and analyzing multi-dimensional images. It’s built on Qt (for the GUI), VisPy (for performant GPU-based rendering), and the scientific Python stack (NumPy, SciPy, and friends).
+
+For more information, examples, and documentation, please visit our website: https://napari.org/

additional_notes/0.5.4/highlights.md

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+Another release with a lot of bug fixes, but also some (more!) improvements to
+Shapes layer performance ([#7144](https://github.com/napari/napari/pull/7144),
+[#7256](https://github.com/napari/napari/pull/7256)), and a few nice
+usability/quality of life features!
+
+- you can now follow the value under the cursor around in images in 3D view as
+  well as 2D ([#7126](https://github.com/napari/napari/pull/7126))
+- Use standard keyboard shortcuts to zoom in and out ({kbd}`Command/Ctrl+=`,
+  {kbd}`Command/Ctrl+-`) and to zoom-to-fit ({kbd}`Command/Ctrl+0`)
+  ([#7200](https://github.com/napari/napari/pull/7200))
+- you can now save tiff files larger than 4GB
+  ([#7242](https://github.com/napari/napari/pull/7242))
+
+Finally, we're starting some work on tweaking the UI to make it more
+self-consistent, with the ultimate goal of adding functionality such as showing
+common controls when multiple layers are selected, so that, for example, you
+can select multiple layers and adjust all their opacity settings together. As
+the first step for this, the *layer blending* controls have been moved directly
+under the opacity control, so that all per-layer controls are next to each
+other in the UI ([#7202](https://github.com/napari/napari/pull/7202))
+
+Read on for all the changes in this version!