chore(README.md): remove useless text

Signed-off-by: Edouard Lopez <dev+git@edouard-lopez.com>
docs(README,manual-install): update

Signed-off-by: Edouard Lopez <dev+git@edouard-lopez.com>
fix(init-script): remove 'function' keyword for POSIX compatibility

Signed-off-by: Edouard Lopez <dev+git@edouard-lopez.com>
fix(proxy-ssh,start): correct call from 'usage' to 'proxy_usage'

Signed-off-by: Edouard Lopez <dev+git@edouard-lopez.com>
refactor(init): use environment variable LOGNAME instead of function
style(position): move initDir variable to the top
style(init): create variable for source repository