docs: Add help section for updating server packs

HELP.md

build.gradle.kts

img/updating_server_packs.png

serverpackcreator-api/build.gradle.kts

serverpackcreator-api/src/main/resources/HELP.md

...rverpackcreator/app/gui/window/settings/GlobalSettings.kt

serverpackcreator-help/Writerside/topics/CHANGELOG.md

serverpackcreator-help/Writerside/topics/CONTRIBUTING.md

serverpackcreator-help/Writerside/topics/HELP.md

serverpackcreator-help/Writerside/topics/LICENSE

serverpackcreator-help/Writerside/topics/README.md

serverpackcreator-help/Writerside/topics/img/add.xcf

serverpackcreator-help/Writerside/topics/img/app.icns

...ckcreator-help/Writerside/topics/img/banner_installer.png

...eator-help/Writerside/topics/img/banner_installer_fin.png

serverpackcreator-help/Writerside/topics/img/checkmark.xcf

serverpackcreator-help/Writerside/topics/img/error.xcf

...creator-help/Writerside/topics/img/expert_help_toggle.xcf

serverpackcreator-help/Writerside/topics/img/generating.xcf

serverpackcreator-help/Writerside/topics/img/hastebin.xcf