[Ivette] help : move scroll function from help to markdown

ivette/.dome-pkg-app.lock

ivette/package.json

ivette/src/dome/renderer/help.tsx

ivette/src/dome/renderer/style.css

ivette/src/dome/renderer/text/markdown.tsx

ivette/src/dome/renderer/text/style.css

ivette/src/sandbox/help.tsx

ivette/src/sandbox/panel.tsx

ivette/src/sandbox/sandbox.md

ivette/yarn.lock