Support Optimizer v1.0.8

• Fixed: several in-app help ("?") texts still described how the app worked before v1.0.6. Fill cavities and Fill tunnels now explain the current sealing margins (a buried cavity is sealed in full, a tunnel always keeps a 1-voxel margin so its opening is never closed over), and Find cavities / Find tunnels no longer claim that each button refreshes both lists.
• The Optimize orientation help now mentions that the search is randomly rotated on every run, so the result doesn't depend on how the structure is oriented in its file
• Smaller help-text corrections for Undo and "Ligands & ions found"
• The README now links to these installers, explains how releases are published, and describes water/ligand handling, 3MF colors and the colorblind toggle