Custom SVG for nodes, update webpack

Full Changelog

Implemented enhancements:

• Graph Rerendering #51
• Feature/provide svg for nodes #60 (danielcaldas) #36

Fixed bugs:

• Graph Rerendering #51

Merged pull requests:

• Improve naming across rd3g codebase #62 (danielcaldas)
• Feature/update webpack #61 (danielcaldas)
• Feature/provide svg for nodes #60 (danielcaldas)
• Fixing a broken link #55 (ufo2mstar)
• Feature/add prettier #53 (danielcaldas)