Fix doxygen documentation build & deploy docs

[Totktonada]

https://travis-ci.org/tarantool/msgpuck/jobs/491532216#L798

/build/usr/src/debug/msgpuck-2.0.22/msgpuck.h:846: Error: Unexpected character `"'
/build/usr/src/debug/msgpuck-2.0.22/msgpuck.h:769: Warning: Found unknown command `\0'
/build/usr/src/debug/msgpuck-2.0.22/msgpuck.h:846: Error: Unexpected character `"'
/build/usr/src/debug/msgpuck-2.0.22/msgpuck.h:901: Warning: Found unknown command `\0'

[Totktonada]

There is https://rtsisyk.github.io/msgpuck, it would be neat to have similar https://tarantool.github.io/msgpuck

[Totktonada]

It may be important for the documentation team to refer actual API.

[Totktonada]

For ones who interested in automatic uploading to gh-pages I can suggest tarantool/graphql.0@7f02ebc as example.