refactor: move popper to layout namespace #190 #189

showroom/source/components.layout.popper.html

.../source/examples/components/layout/popper-click/main.html

...ource/examples/components/layout/popper-click/readme.html

...source/examples/components/layout/popper-click/script.mjs

...source/examples/components/layout/popper-simple/main.html

...urce/examples/components/layout/popper-simple/readme.html

...ource/examples/components/layout/popper-simple/script.mjs

.../components/navigation/table-of-content-simple/script.mjs

...oom/source/fragments/components/layout/popper/design.html

...m/source/fragments/components/layout/popper/overview.html

...om/source/fragments/components/layout/popper/show-it.html

...gments/components/navigation/table-of-content/design.html

...ents/components/navigation/table-of-content/overview.html

...ments/components/navigation/table-of-content/show-it.html

source/components/datatable/stylesheet/dataset.mjs

source/components/datatable/stylesheet/datatable.mjs

source/components/form/popper.mjs

source/components/form/stylesheet/button-bar.mjs

source/components/form/stylesheet/confirm-button.mjs

source/components/form/stylesheet/form.mjs