navbar additions

[John-Fleming]

User Story

As a user, I should see the band logo in the far left of the navbar

AC

WHEN the page loads THEN I should see the nav bar on each page AND I should see the band logo in the far left hand side of the nav bar

Dev Notes

• add a link tag within the bootstrap navbar code that references the logo file saved in the assets folder - <a class="navbar-brand" href="#"></a>
• this should go above all the nav-item elements in the nav-bar code block
• correct #index.html to ./index.html on about.html page in navbar link section