Adds initial landing page template

[paola4]

Description

1) Adds the initial template for the landing page, including parallax background and fixed navbar.

Related Story Card

SCRUM-51

Type of Changes

New page

Acceptance Criteria

• [X] Given I am visiting the website and am not logged in,
• [X] When I navigate to the platform's main URL,
• [X] Then the system displays Uncloud’s landing page that showcases the platform's core functionalities and benefits, and invites the user to “Start Now” (makes account creation clear).

Update Screenshots

After

Testing Instructions

1. Play around with different window sizes, and try scrolling; ensure that the background looks okay (there should be a cloudy background at the top, and it should transition to a white background).
2. Ensure the links to log in and register work, and that those pages look okay with the updated navbar.

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