Add dev_build and dev_mode flags to SCons compilation instructions for desktop editor pages

[jonathansekela]

This is for Issue #10018.

Add instructions to compile SCons with dev_build=yes and dev_mode=yes flags to desktop documentation pages.

[jonathansekela]

For @bruvzg 's mention on The dev_build parameter being the specific one making sure the debug symbols are included and dev_mode doing something slightly different, I'm assuming I should modify the documentation to reflect what each parameter does specifically?

[jonathansekela]

Alternatively, I could just put a link to the Introduction page's development and production aliases headline: https://docs.godotengine.org/en/stable/contributing/development/compiling/introduction_to_the_buildsystem.html#development-and-production-aliases

This entire PR stems from the idea that many first-time contributors skip the Introduction documentation and go directly to their personal platform's installation instructions. Any ideas on the best way to give them the information they need as unobtrusively as possible?

[bruvzg]

Alternatively, I could just put a link to the Introduction page's development and production aliases headline

This probably is a better option, and will avoid unnecessary duplication of the same info on multiple pages. use breakpoints while developing feels too broad and does not mention any negative effects. Most users probably do not want to use it, since disabling optimizations make the engine a lot slower.

[tetrapod00]

What about another tip or note box, just before or after the one about the one about production=yes?

Tip
If you are compiling Godot to make changes or contribute to the engine, you may want to use the SCons options dev_build=yes or dev_mode=yes. See https://docs.godotengine.org/en/stable/contributing/development/compiling/introduction_to_the_buildsystem.html#development-and-production-aliases for more info.

(The section for dev_build is immediately after the linked section, so just the one link should suffice.)