27 fixed link to book

[emtelgen]

removed library link
added information to direct users to specific links

[emtelgen]

• failed due to mkdocs deploy, not sure why
• i put 27 in the title because it goes with issue 27 but it didn't add it to the issue information not sure why that did not happen

[billspat]

related to your comment: "i put 27 in the title because it goes with issue 27" I think in PRs and in Commit messages you have to prepend the issue number with number sign: " #27 " to get them to link. You could edit the title of this PR to "#27 fixed link to book" and that should work.

[billspat]

test run on this old pull request into a test branch. Don't have a great way to test other than pulling the branch onto a computer and building with mkdocs.