add blogpost explaining layer splitting

docs/content/blog/2024.md

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+---
+title: "2024"
+menu:
+  main:
+    identifier: "2024"
+    parent: "Blog"
+    weight: 20
+---

docs/content/blog/posts/2024/24-12-06-layer-unzipping.md

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+---
+title: "Layer Unzipping"
+menu:
+  main:
+    identifier: "24-12-06-layer-unzipping"
+    parent: "2024"
+    weight: 10
+---
+
+_By Maximilian Kasperowski, December 6, 2024_
+
+The coming update (ELK 0.9.2) introduces a new feature to control the positioning of nodes in a layer for further compaction.
+Layer Unzipping can split up the nodes of a single layer into multiple layers.
+This reduces the total height and can be helpful in certain situations.
+
+The update introduces three new properties:
+- `org.eclipse.elk.layerUnzipping.strategy`
+- `org.eclipse.elk.layerUnzipping.layerSplit`
+- `org.eclipse.elk.layerUnizpping.resetOnLongEdges`
+
+This [elklive example](https://rtsys.informatik.uni-kiel.de/elklive/elkgraph.html?compressedContent=MYewdgzglgJgpgJwLIngGwPIPggdBAFwQEMC4BzATwC4ACABQCUBRAMWcYH1mARAcWYBlAFBpilRAFUwALygAHeVDDl8RUhRq0AggBkAKhwBy2-QEkjfYcLCo4tMAEZa1uDHL2ntALQA+BwBMLm4eDs5+DgDMwiGeQRFgACwx7p4ArD7+Sa6pYZkOybF5CWkpoV4JAGzWAPQ1tABmUAiEtGIIoWISCDZ2gbQA3sK0I23iUrIKSiq4CHAQcAQYYLrg5MypEHQNxGgLtHW0MFAQxABGaPbwOwCuaAS0Z3AAFsQAblAgNwi0xGAwtCIcFIbTWtFiEF+kLm5DuxB+tngEGEAF9evAooNhqMuhM5IplKpcQhBPI0FACHQAqj0Z5Ei5EekGX0wJUXMJDgtQP8xh17MTaYFnENRmNutJ8dMieMSWSKXRomjGVFnIKkqrlWA0hqWZVVWU6fl1cFcqyjXqcuUAuEsgB2E3lSI2hz2g0FZ1gV1FLUer2mvVG11q21AA) demonstrates the properties and the exact behaviour of the properties is explained in the sections below.
+
+## Layer Unzipping Strategy
+For now there is only the strategy `LayerUnzippingStrategy.ALTERNATING`.
+It evenly distributes the nodes into several sub-layers.
+The first node goes into the first sub-layer, the second goes into the second and so on.
+The default configuration is to use two sub-layers.
+
+## Configuring the Number of Sub-layers
+The number of sub-layers is two by default and can be changed with the `layerSplit` property.
+The property applies to an entire layer.
+To use it, it must be set on any node of that layer.
+If multiple values are set, then the lowest value is used.
+
+## Long Edge Treatment
+Under the hood long edges are implemented using invisible dummy nodes.
+The default behaviour is begin the alternatinon anew after a long edge, but this behaviour can be disabled for a layer by setting `resetOnLongEdges` to `false` for any node in the layer.