Merge branch 'nextmixin-add' into 'master'

source/import_documentation/Components/Solid-Calendar.rst

source/import_documentation/Components/Solid-Delete.rst

source/import_documentation/Components/Solid-Display.rst

source/import_documentation/Components/Solid-Form.rst

source/import_documentation/Components/Solid-Lang.rst

source/import_documentation/Components/Solid-Map.rst

source/import_documentation/Mixins/list-mixin.rst

source/import_documentation/Mixins/next-mixin.rst

source/import_documentation/Mixins/store-mixin.rst

source/import_documentation/Store-doc.rst

source/index.rst