Settings update

Added:

• /settings page
• /settings page will be opened on first start
• /settings entries autogeneration
• Options parser (see dermod/helpers.py)

Updated:

• README.md
• • /settings generator docs added
• • minor changes
• settings_file.py
• • Changes to comply with autogenerator
• All html pages
• • Background color is #faffd5
• • Can be changed in templates/base.html (line 11)
• • Dark mode works stays #000000