Feature suggestion: scroll browser view to "match" vim point in text.

[jasonm23]

Caveat emptor. With images, extensive katex/mathjax, unbroken lines in source text, etc. The relative browser page position will be indeterminate.

• When the user moves the cursor in vim.
• Given a vim-markdown-view session is open/active.
• Then the browser should scroll to approximately the same location. (e.g. page percent)

It should also be optional/tune-able, to avoid too many renders.