Add new swa projects

_projects/sandblocks.md

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+---
+title:      Sandblocks
+img-src:    projects/sandblocks.png
+href:       https://github.com/hpi-swa/sandblocks
+---
+A block-based editor and programming environment for Squeak. It supports visual augmentations of source code, example-driven (Babylonian) programming, and experimental integration of over 20 additional languages.

_projects/semantictext.md

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+---
+title:      SemanticText
+img-src:    projects/semantictext.png
+href:       https://github.com/hpi-swa-lab/Squeak-SemanticText
+---
+A framework and playground for generative AI. It integrates OpenAI models to build chatbots that can process and create text, images, and speech. SemanticText also augments various Squeak tools such as help browsers and Squeak Inbox Talk with semantic search and smart summaries.

_projects/tracedebugger.md

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+---
+title:      TraceDebugger
+img-src:    projects/tracedebugger.png
+href:       https://github.com/hpi-swa-lab/squeak-tracedebugger
+---
+A lightweight back-in-time debugger to trace and retrace method invocations and state changes.
+It also supports [visualizing](https://dl.acm.org/doi/epdf/10.1145/3594671.3594678) the evolution of objects.
+TraceDebugger is built on the [SimulationStudio](https://github.com/LinqLover/SimulationStudio) framework, which modifies code interpretation without changing individual methods or the virtual machine.