Make Input and Title Screen Unbricked Consistent with other Folders

[Les-Wet]

As discussed in #137 (comment) the Input folder of unbricked has an input.asm file that is unused and copied into the main.asm. This pull request removes this file and makes the code indentation more consistent (see #83 (comment)). In addition to this, this PR makes the Title Screen folder consistent with the rest of the tutorial by not including input.asm in its build script, and by placing the code in its main.asm instead. This should make the build scripts easy for a beginner to read.

Alternatively we could introduce linking multiple assembly files in the title screen section as I see the serial link tutorial is doing now. Since the serial link tutorial is rather dense and the title screen is sparse maybe front-loading linking multiple files together could be beneficial?

Let me know what you think. If we want to leave it up to serial link to introduce the additional linking concept, then this PR will do as is. If not I can open a new one where I refactor the tutorial slightly to introduce this earlier (e.g. remove it from serial link, add it to title screen).

[ISSOtm]

Since the first part already dealt with introducing single-file projects, I think it's fair to build up on that complexity a little in Part II. My vote is thus in favour of introducing multi-object projects, especially if the occasion lends itself well to it.

Thanks!