Unify express.static directory.

[haeungun]

absolute/server/base/application.ts

Line 25 in 0bbafb5

this.app.use(express.static(path.join(__dirname, '../../client')));

absolute/server/base/application.ts

Line 31 in 0bbafb5

this.app.use(express.static(path.join(__dirname, '../../client')));

In applictation.ts, there are two codes which adding static files information to server.
Unfortunately, this two actual directories are not same. We should unify it or do something for maintenance.

[romandev]

@haeungun are you interested in this issue?
If you are busy due to other things what you are working on, we can pass this issue to another contributors :)