v0.1.0-alpha.1 — Setup source documentation

Documentation update for the first public alpha.\n\n- Adds a component-by-component table with direct sources\n- Links the exact VapourKit nightly used during development\n- Adds the official VapourKit community Discord\n- Links Depth Anything V2, TorchVision RAFT, Video Helper Suite, NVIDIA DLSS, ComfyUI, and NVIDIA drivers\n- Clearly distinguishes automatic downloads, optional dependencies, and the user-supplied proprietary neural-rendering runtime\n\nNo proprietary NVIDIA or VapourKit binaries are distributed.