adjust mobile header action slot layout and add documentation/license files
- ts_web/elements/00group-ui/dees-mobile-header/dees-mobile-header.ts: change ::slotted([slot="actions"]) from fixed width/height to min-width/min-height, switch display from block to flex and add align-items:center to improve vertical alignment
- Add MIT license file at /license
- Add extensive readme.md (documentation, install instructions, component usage, development and legal info)