PR: Fix minor issues in the home page

[dalthviz]

Fixes #68

TODO:

• Change favicon (possible need to delete cache to refresh favicon.ico)
• Fix sticky navbar.
• Width of the banner.
• Working links in Team section.
• Background colors of the sections.

[goanpeca]

@ccordoba12 @dalthviz should I point spyder-ide.org to the actual site?

[dalthviz]

@goanpeca I thought that we are going to do that after changing the style of the blog, althought I'm will have done that the next week probably :). So in a week or so maybe we should do the redirection of the domain?

[goanpeca]

@dalthviz ok, ping me then ;-)

[dalthviz]

@ccordoba12 a preview of the banner:

[ccordoba12]

@dalthviz, I like it, it looks good. For the banner, please take the left part of image 2b (without the border) from

spyder-ide/spyder#6352 (comment)

[ccordoba12]

Also, the width of the banner must be the same of the text below it.

[ccordoba12]

Thanks a lot @dalthviz! Let's merge this one, so I can give you feedback over the live website.