Update the twitter logo to `X`

[multignite]

Describe the solution you'd like
Change the old twitter logo with the new stupid 'x' logo

In this version primeicons are used

The project does not involve the use of font-awesome nor google material icons all icons are provided by peimeicons,

Prerequisite missing

• wait until PrimeNG provides an updated X primeicon

DO NOT USE PNG or inline SVGs

• it desn't seem like PrimeNG allows a good way of importing custom SVG icons,
• the examples that they show involve ither PNG or inline SVG - those options are not accepted

so either wait for PrimeNG, contribute to PprimeNG primeicons, or think of another way