Improve UI for password resets + login + bugfixes

• Fixes for active states in sidebar [@saeedhmt ]
• Fixes missing button in StackedInline and readonly field alignment [@
  Pavel Pančocha]
• Remove pyenv local version + upgrade CI action [@dhvcc ]
• Fix related objects buttons not firing JS event [@dekomote ]
• DRY up and Improve login template + add in proper password reset suppport [@timoludwig ]