Merge pull request #14 from hokorobi/patch-1

Fix missing '

Use relative path in import command

Use better default settings

Update README and documentation

Set conceallevel=2 in popup window

Enable 'smoothscroll' in preview popup

Remove unnecessary extend() call

Replace :hi-link commands with hlset() function

Use string interpolation instead of printf()

Update README and doc to vim9script

Be more consistent with method-call syntax

Rename Get() to Getopt()

Replace len() with strwidth() for popup title

Be more consistent with method-call syntax