Add option to ignore [example link](#)

[chris-dura]

There's some legit reasons that you may want to have a link that actually doesn't go anywhere in the markdown, like [example link text](#), especially in documentation sites.

In fact, you may want to be able to ignore any particular pattern in the link URL (not just ignore a particular filename pattern). For example:

Here's a [internal link](https://auth.my-project.com) that is behind Oauth, so it'll always look ☠️, but it's not 💀

[chris-dura]

Or, another use case for ignoring (or removing) a certain RegEx pattern from the link URL. The markdown-it-imsize plugin requires additional syntax in the image link.

Here is a ![32px Camera Icon](./images/camera.svg =32x) camera icon.

And the output from check-md:

File is not found: ![32px Camera Icon](./images/camera.svg =32x) (/Users/CDura/code/my-project/foo/README.md:23:172)

[LucienZhang]

Another case for ignoring certain pattern is for footnote syntax. check here

Here is a footnote reference[^1].

[^1]: Here is the footnote.    <-- this will raise an error of "File is not found"

[scbj]

Another case for ignoring certain pattern is for footnote syntax. check here

Here is a footnote reference[^1].

[^1]: Here is the footnote.    <-- this will raise an error of "File is not found"

This feature for footnotes has been resolved in #8