Fixed deprecated package and error

[Kardi5]

Fixed deprecated usage of \tt package and moved cleverref package to be the last package loaded to avoid errors.

See:

• \tt usage deprecated: https://github.com/gettalong/kramdown/issues/257
• cleverref only showing "??" instead of reference if loaded to early in config.tex: https://tex.stackexchange.com/questions/1863/which-packages-should-be-loaded-after-hyperref-instead-of-before

Before:

After:

[hintzed]

Thanks for the fix and the good PR!