Refactor structure

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/shells/java/default.nix

@@ -0,0 +1,8 @@
+{ pkgs, ... }:
+pkgs.mkShell {
+  packages = with pkgs; [ jdk ];
+
+  shellHook = ''
+    export JAVA_HOME=${pkgs.jdk.home}
+  '';
+}

hosts/common/shells/java17/default.nix

@@ -1,10 +0,0 @@
-{ pkgs, ... }:
-pkgs.mkShell {
-  packages = with pkgs; [
-    jdk17
-  ];
-
-  shellHook = ''
-    export JAVA_HOME=${pkgs.jdk17.home}
-  '';
-}

hosts/common/shells/sas/default.nix

@@ -1,28 +0,0 @@
-{ pkgs, ... }:
-pkgs.mkShell {
-  packages = with pkgs; [
-    go
-    gopls
-    go-tools
-    golangci-lint
-    golangci-lint-langserver
-    jdk17
-  ];
-
-  shellHook = ''
-    if git rev-parse --is-inside-work-tree &> /dev/null; then
-      TOP="$(git rev-parse --show-toplevel)"
-      if ! grep -q "^\.go$" "$TOP/.gitignore" "$TOP/.git/info/exclude"; then echo ".go" >> "$TOP/.git/info/exclude"; fi
-      if ! grep -q "^\.gradle$" "$TOP/.gitignore" "$TOP/.git/info/exclude"; then echo ".gradle" >> "$TOP/.git/info/exclude"; fi
-    else
-      TOP="$(pwd)"
-    fi
-
-    export GOPATH="$TOP/.go"
-    export GOPROXY=goproxy.unx.sas.com
-    export GONOSUMDB=*.sas.com,sassoftware.io
-    export JAVA_HOME="${pkgs.jdk17.home}"
-    export GRADLE_USER_HOME="$TOP/.gradle"
-    mkdir -p "$GRADLE_USER_HOME" && cp -f ~/.gradle/gradle.properties "$GRADLE_USER_HOME/gradle.properties"
-  '';
-}