chore: set max-width for large screens and fix margins

[siddarthkay]

Notes for Reviewers

This PR fixes 624

• set a site-max-width var which i use in navbar and container-fluid classes.
• also fix margin in footer to remove left and right margin which interferes with max-width setting.

Looks good now.

Signed commits

• Yes, I signed my commits.

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[Bhumikagarggg]

@siddarthkay Thank you for your contribution! Let's discuss this during the website call today at 6:30 PM IST | 7 AM CST Add it as an agenda item to the meeting minutes, if you would 🙂

[siddarthkay]

Hi @Bhumikagarggg : I won't be able to join this call, I have a full time job and do open source in free time.
The PR diff is very minimal and shouldn't need a call to explain/discuss.
Any engineer on the team could give a brief look and provide feedback on the PR itself.

I'll look forward to the feedback.

Thank you.

[Bhumikagarggg]

@siddarthkay Thank you for your contribution! Let's discuss this during the website call today at 5:30 PM IST | 6 AM CST Add it as an agenda item to the meeting minutes, if you would 🙂

[siddarthkay]

@Bhumikagarggg : perhaps you missed my previous message.
Is there no way to get this reviewed async? I can't join these calls I'm sorry.