fix(README.md): update guide icon

docs(README.md) move to wiki

chore(.gitignore): add mac fluff

docs(README.md): add Pd

docs(README.md): add shields

fix(README.md): amend video times

fix(README.md): add video times

fix(README.md): typo

fix(README.md): typo

docs(README.md): add .gif

feat(README.md): add video cards

fix(README.md): clarification of fork / contributors

fix(unity/assets/): remove unrelated scenes, patches, scripts

docs(README.md): update video thumbnails

fix(README.md): reorder blocks