Addition of internal jQuery and Navbar fix

[roninx991]

• [x] Included a Preview link and screenshot showing after and before the changes.
• [x] Included a description of the change below.
• [x] Squashed the commits.

Changes done in this Pull Request

• Preview Link

• 639

Description / Changes

1. Addition of jquery-

Internal jquery has been added as many libraries depended on it. However addition of internal jquery induced some new issues such as broken slider and navbar issues.

2. Navbar Fix-

Fixed navbar according to theme.

Issues which are still remaining to be fixed

1. Broken image slider
2. Code appearing at the bottom of page
3. Color of drop down menu in the navbar

I will be working on the above issues as well.

Screenshots if any:

Before:

After:

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[roninx991]

@sk9331657 @NishithP2004 @pranav1698 @rctay I have fixed the preview link. Since it was my first PR, I made this small mistake. Please review my PR again. And thanks for the feedback. (PS: There are still some issues yet to be solved and I'm working on it.)

[roninx991]

@NishithP2004 I don't know, the original repo didn't have gitter link.

[roninx991]

Thanks @NishithP2004

[roninx991]

@pranav1698 I'm working on it. Mostly the javascript needs some tweaks. I have mentioned the bugs that are remaining to be solved.