updated formatting of SC troubelshooting
Update troubleshooting.md
Update index.md
added config SC article on hostname settings
added config SC article on hostname settings
Added link to setting-custom-hostname
Update how-to-configure-endpoints-for-monitoring.md
Update how-to-develop-custom-checks.md
Update menu.txt
Update README.md
Update architectural-principles.md
Update architectural-principles.md
update sidebar logos

fixes #194