Features suggestions

[nathan-gt]

• Add the option to echo a github actions warning for each broken link found
• Add the option to color code the console output to more quickly spot which links are broken (make broken links appear red)
• Add the option of displaying the total number of links that have been processed and show the number of dead links that have been found at the end of the program and not just per file.

[gaurav-nelson]

Thanks @nathan-gt
Since this action is dependent on markdown-link-check some of these options can only work if the original library supports them. However, I am working on an update, possibly a new project, to replace this action. For now, I'll have a look what is doable currently and include that.

[btosello]

I want to search 3 differents extensions... like ".md, .markdown, .mdx" I dont find the way to do it