General improvements

[Senyoret1]

Changes:

• Angular was updated to v13.
• TSLint was replaced with ESLint, as TSLint was removed in Angular 13. Several changes were made to solve problems returned by the new linter.

Does this change need to mentioned in CHANGELOG.md?
No

[Senyoret1]

The last commit updates the Angular version to 13.2

[Senyoret1]

The last commit updates Angular to v14.

[Senyoret1]

The last commit updates Angular from v14.2.0 to v14.2.11

[Senyoret1]

The last commit updates Angular from v14 to v15.

[Senyoret1]

The last commit migrates the e2e tests from Protractor to WebdriverIO, as Protractor was deprecated and no more updates will be added soon (which are needed for browser compatibility)

[Senyoret1]

The last commit fixes the remaining problems with the e2e test.

[Senyoret1]

The last commits include the following changes:

• Most social icons were removed from the footer and the side menu (shown on small windows). Now only the icons shown on the website are shown.
• The documentation was updated.

[Senyoret1]

The last commit makes the whole app use page state management, as it is more usable with the new verisons of Angular. This makes the app remember the state while the user navigates with the browser buttons, which means remembering the scroll position, avoid reloading previously loaded data from the server and changes like that, which make the Angular app work more like a traditional webpage, as is expected by the users.

[Senyoret1]

The last PR removes the buy button from the header