Use hashids to mask IDs in URL

[koolskateguy89]

• Add dependencies
• Define /lib/hashids
• Define pepper, i.e. secret salt
  • Wanted to define it as env var but then it's not accessible in ProjectsList
  • So it's defined as a constant, but I think it might be accessible on client if they try hard enough
• Use in /projects/:id
  • Use in ProjectsList
  • Use in /dashboard
• Use in /forum/posts/:id
  • Use in /forum