chore: clean up "contrib" dir (#37690)

1. remove useless files like "backport.go", "update_dependencies.sh"
2. remove outdated "init" scripts, only keep one in sysvinit, gentoo dir
is also kept because it still uses openrc
3. move "service" related config and scripts into "service" directory

contrib/development/README.md

@@ -0,0 +1,12 @@
+# IDE and code editor configuration
+
+## Table of Contents
+- [IDE and code editor configuration](#ide-and-code-editor-configuration)
+  - [Microsoft Visual Studio Code](#microsoft-visual-studio-code)
+
+## Microsoft Visual Studio Code
+Download Microsoft Visual Studio Code at https://code.visualstudio.com/ and follow instructions at https://code.visualstudio.com/docs/languages/go to setup Go extension for it.
+
+Create new directory `.vscode` in Gitea root folder and copy contents of folder [contrib/ide/vscode](vscode/) to it. You can now use `Ctrl`+`Shift`+`B` to build gitea executable and `F5` to run it in debug mode.
+
+Supported on Debian, Ubuntu, Red Hat, Fedora, SUSE Linux, MacOS and Microsoft Windows.

contrib/development/vscode/launch.json

@@ -0,0 +1,18 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch",
+      "type": "go",
+      "request": "launch",
+      "mode": "debug",
+      "buildFlags": "",
+      "program": "${workspaceRoot}/main.go",
+      "env": {
+        "GITEA_WORK_DIR": "${workspaceRoot}",
+      },
+      "args": ["web"],
+      "showLog": true
+    }
+  ]
+}

contrib/development/vscode/settings.json

@@ -0,0 +1,4 @@
+{
+    "go.buildTags": "",
+    "go.testFlags": ["-v"]
+}

contrib/development/vscode/tasks.json

@@ -0,0 +1,27 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Build",
+      "type": "shell",
+      "command": "go",
+      "group": "build",
+      "presentation": {
+        "echo": true,
+        "reveal": "always",
+        "focus": false,
+        "panel": "shared"
+      },
+      "linux": {
+        "args": ["build", "-o", "gitea", "${workspaceRoot}/main.go" ]
+      },
+      "osx": {
+        "args": ["build", "-o", "gitea", "${workspaceRoot}/main.go" ]
+      },
+      "windows": {
+        "args": ["build", "-o", "gitea.exe", "\"${workspaceRoot}\\main.go\""]
+      },
+      "problemMatcher": ["$go"]
+    }
+  ]
+}