More small improvements

Thanks to many sharp-eyed readers, a number of small improvements:

• Links to @windsting's Chinese translation, plus the correct author credit
• Better explanation of service container lifecycles (discussion in #26)
• Explain the -o flag as suggested in gitbook#10
• Remove semicolons after Razor directives to match the style of the official docs (#44)
• Explained that the port may not always be 5000 (#30)
• Added a few small Gitbook plugins for better web rendering
• Typos

The latest version is always available from littleasp.net/book. ☕️