* docs: experimental rewrite of instance.md, introducing data-methods.md

* docs: cut material from instance.md that isn't on topic

* docs: move data-methods.md to after template-syntax.md

* fix: change 'application' to 'component' in template-syntax.md

* fix: use bold when introducing new terms in instance.md

* docs: rewrite data-methods.md

Co-authored-by: kazuya kawaguchi <[email protected]>