clean up repetative cargo env sourcing

.bash_profile

@@ -1,11 +1,11 @@
 if [[ -f "$HOME/.bashrc" ]]; then
-    source "$HOME/.bashrc"
+    . "$HOME/.bashrc"
 fi
 
 if [[ -f "$HOME/.cargo/env" ]]; then
-    source "$HOME/.cargo/env"
+    . "$HOME/.cargo/env"
 fi
 
 if [[ -f "$HOME/.nix-profile/etc/profile.d/nix.sh" ]]; then
-    source "$HOME/.nix-profile/etc/profile.d/nix.sh"
+    . "$HOME/.nix-profile/etc/profile.d/nix.sh"
 fi

.bashrc

@@ -91,10 +91,6 @@ if [ -d /usr/local/go ]; then
     export PATH=$PATH:$HOME/go/bin:/usr/local/go/bin
 fi
 
-if [ -f "$HOME/.cargo/env" ]; then
-    source "$HOME/.cargo/env"
-fi
-
 export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
 [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion