close #26

Auto overflow makes the empty scrollbar disappear when it's not needed but shown when there's not enough vertical space to display all items.

This is my biggest pet peeve on earth 😅Love this project so far, can't wait to try it out on something real!

close #8

* missing link

* prefer GitHub URL

That margin was creating horizontal scroll when it wasn't necessary

Until now, only `README.md` files got treated as a directory index.
This commit also allows `index.md` to be used as index files.

The CSS rule `&:nth-child(2)` only highlights the second table row.

This change will highlight every second table row, which improves
readability.

I find  when I use index.md,  the serve will return a status of 404, but when I change to readme.md, it works

If vuepress is run in the root of a node package
(eg. `vuepress build .`), it would include all markdown files from
the `node_modules` folder, which breaks the build process.

Updating `rel="noopener noreferrer"` for Edge and (partial) IE11 support:
https://caniuse.com/#search=noopener 
https://caniuse.com/#search=noreferrer
Reason here: https://www.jitbit.com/alexblog/256-targetblank---the-most-underestimated-vulnerability-ever/