UI improvements

[killua-eu]

Tests:

• https://codesandbox.io/s/9261zo19rp

To try:

• https://getbootstrap.com/docs/4.0/examples/floating-labels/

Assets:

• https://select2.org/
• Bootstrap
• https://github.com/vaizard/glued-modular-admin
• RJSF

To-do:

• Use composer plugin to fetch assets
  • https://github.com/fxpio/composer-asset-plugin
• Shamelessly copy from https://github.com/directus/directus / https://directus.app/

[pohadkar]

zpusob jak aktivovat floating labels.
mame dve verze. podtrzeny input a oramovany input.
v ramovanem je label i value odsazene od leva.

pro rjsf:
podtrzene inputy:
je treba mit v sablone promennou json_formdata_render_custom_array
pak se v ui schema pro dane policko pouzije

 "ui:widget" : "floatingLabelWidget",
 classNames : "form-label-group"

pro oramovane inputy:
je treba mit v sablone promennou json_formdata_render_custom_array
v ui schema staci pouzit pro dane policko toto
classNames : "form-label-group shifted-label"

[killua-eu]

Floating labels done with PR #127 - see contacts interface.