- Changed all British spellings to American spellings, in the Customizing admin templates section of the docs
- Transferred all British spellings in the usage guide and advanced topics section to American spellings
- Update a series of other pages to use the spelling cutomize in the file name
Implemented all feedbacks on the usage guide and advanced topics section
- fix some broken refs that were lost in the migration to markdown files
- use lower_snake_case for all internal refs (most follow this convention)
- release process sub-section in docs should be named release schedule instead
