fixed the ui(modified navbar,pre-register form,course component),added footer component

[Rudra-Sankha-Sinhamahapatra]

Made some changes on the navbar like made the text of the 100xdevs to white ..it looks better...Changed the bg of two buttons of navbar..

Added spacing between the courses before it was covering the whole width and touching each other ...i tried to make it better

customized the pre register component ,adjust it as per your requirements

Made some other ui enhcancements

https://github.com/code100x/100xdevs-landing-page/assets/101992909/e105a98f-2c3d-4827-bd2c-dad532ce26b7

also added this beautiful footer component ,will add the quick links page routes later if you want to change something in footer then change it as per your requirements

https://github.com/code100x/100xdevs-landing-page/assets/101992909/594eaa53-7904-4a6b-9a2e-2831c971217d

If there is mistake or need of improvement then it would be great to contribute

[punyakrit]

@hkirat can i also contribute in building the UI made by @SujithThirumalaisamy doesn't look modern in terms of retention rate

[Rudra-Sankha-Sinhamahapatra]

@hkirat kindly check this pr ,would love to hear from you sir