Many Docker Building Fixes/Improvements (#6552)

* Update DockerBuild.sh

Ensure that the X11 server allows connections from the Docker container.

* Update DockerBuild.sh

Removed fix for X11. Will add to DockerRun.sh

* Update DockerRun.sh

Added help comment to fix and ensure that your X11 server allows connections from the Docker container.

* linxu build with docker in readme

Add build on linux with docker section

* Update README.md

* Update README.md

* Update README.md

remove low ram thing

* Update Dockerfile

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Co-authored-by: samthebest699 <106000727+samthebest699@users.noreply.github.com>
Co-authored-by: SoftFever <softfeverever@gmail.com>

DockerBuild.sh

@@ -2,7 +2,6 @@
 PROJECT_ROOT=$(cd -P -- "$(dirname -- "$0")" && printf '%s\n' "$(pwd -P)")
 
 set -x
-
 # Wishlist hint:  For developers, creating a Docker Compose 
 # setup with persistent volumes for the build & deps directories
 # would speed up recompile times significantly.  For end users,