Improved UI of the project cards

[AJgthb2002]

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Resolves Issue #6

• This pull request adds a placeholder image to the project preview. It can be replaced by an image corresponding to the particular project.

• This pull request makes the cards bigger and displays additional information about the project, such as a short project description, developers and the tech stack used. Placeholder text has been added to all these additional sections.

• The projects.html file has been modified accordingly. The corresponding CSS has also been added in the all.scss file

• Improving the UI of project cards makes them look more attractive and differentiates them from the fellow cards on the same page.

Screenshots showing how the cards look on the webpage across different dimensions:

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