Codecraft v2.6

Release time：2020-11-3
Updates:

  1. Homepage optimizations
  2. Optimized the feedback system, file attachments and code submitting functions now available
  3. Added PC version download link
  4. Added dutch language support for Grove Zero
  5. Help and documentation links were updated
  6. Codecraft courses, projects and Make To Learn links merged into the header
  7. Codecraft assistant now supports Linux system