drop FAQ

There was only one question, specific to u-root, which has its own
documentation that we reference in the chapter on evaluating tools.

Signed-off-by: Daniel Maslowski <info@orangecms.org>

Author: orangecms

src/SUMMARY.md

@@ -22,4 +22,3 @@
   - [Ampere study](case_studies/Ampere_study.md)
   - [Google study](case_studies/Google_study.md)
   - [OCP TiogaPass](case_studies/TiogaPass.md)
-- [Frequently Asked Questions](faq.md)