Updated architecture of the project & new buttons design

[Alex24h]

Forked from PERRINN "client-web" repository on 22/02/2025:

• All further updates on PERRINN "client-web" master branch were taken into account in this version of the code to ease the (potential) merge.
• Reorganised part of the code creating folders for each one of the 6 components (buyPRN, chat, settings, login, profile, directory).
• Separated Typescript code ('logical' part of the components) from the HTML code ('visual' part of the components)
  => Both previous points to ease the navigation through the architecture of the code.
• updated the behaviour of various buttons modifying CSS code refering to "buttonBlack", "buttonWhite" & ".menu img / .menu span" classes/tags.