Use conda + Update initial setup docs

.github/scripts/defaults.sh

@@ -5,18 +5,11 @@ CI_MAKE_NPROC=8
 # chosen based on a 24c system shared with 1 other project
 REMOTE_MAKE_NPROC=4
 
-# verilator version
-VERILATOR_VERSION=v4.034
-
-HOME=$GITHUB_WORKSPACE
-
 # remote variables
 # CI_DIR is defined externally based on the GH repository secret BUILDDIR
 
 REMOTE_PREFIX=$CI_DIR/${GITHUB_REPOSITORY#*/}-${GITHUB_REF_NAME//\//-}
 REMOTE_WORK_DIR=$GITHUB_WORKSPACE
-REMOTE_RISCV_DIR=$GITHUB_WORKSPACE/riscv-tools-install
-REMOTE_ESP_DIR=$GITHUB_WORKSPACE/esp-tools-install
 REMOTE_CHIPYARD_DIR=$GITHUB_WORKSPACE
 REMOTE_SIM_DIR=$REMOTE_CHIPYARD_DIR/sims/verilator
 REMOTE_FIRESIM_DIR=$REMOTE_CHIPYARD_DIR/sims/firesim/sim
@@ -24,13 +17,9 @@ REMOTE_FPGA_DIR=$REMOTE_CHIPYARD_DIR/fpga
 REMOTE_JAVA_OPTS="-Xmx10G -Xss8M"
 # Disable the supershell to greatly improve the readability of SBT output when captured by Circle CI
 REMOTE_SBT_OPTS="-Dsbt.ivy.home=$REMOTE_WORK_DIR/.ivy2 -Dsbt.supershell=false -Dsbt.global.base=$REMOTE_WORK_DIR/.sbt -Dsbt.boot.directory=$REMOTE_WORK_DIR/.sbt/boot"
-REMOTE_VERILATOR_DIR=$REMOTE_PREFIX-$GITHUB_SHA-verilator-install
 
 # local variables (aka within the docker container)
-LOCAL_CHECKOUT_DIR=$HOME/project
-LOCAL_RISCV_DIR=$HOME/riscv-tools-install
-LOCAL_ESP_DIR=$HOME/esp-tools-install
-LOCAL_CHIPYARD_DIR=$HOME
+LOCAL_CHIPYARD_DIR=$GITHUB_WORKSPACE
 LOCAL_SIM_DIR=$LOCAL_CHIPYARD_DIR/sims/verilator
 LOCAL_FIRESIM_DIR=$LOCAL_CHIPYARD_DIR/sims/firesim/sim