feat: implement cut, sync and template

README.md

application/source/command.go

application/source/error.go

application/source/go.mod

application/source/go.sum

application/source/html/cut.go

application/source/html/generate.go

application/source/html/sync.go

application/source/main.go

application/source/template/prepare.go

application/source/types/page-data.go

application/source/types/snippets-specification.go

application/source/types/sync-specification.go

application/source/util/html.go

application/source/util/id.go

development/examples/example1/config/snippet.yaml

development/examples/example1/config/spec1.yaml

development/examples/example1/html/test.html

development/examples/example1/original/test1.html

development/examples/example1/original/test2.html