Move some files under repo/setting (#25585)

There are too many files under `routers/web/repo` and the file
`routers/web/repo/setting.go` is too big.
This PR move all setting related routers' body functions under
`routers/web/repo/setting` and also split `routers/web/repo/setting.go`

routers/web/repo/setting/git_hooks.go

@@ -0,0 +1,65 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package setting
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/git"
+)
+
+// GitHooks hooks of a repository
+func GitHooks(ctx *context.Context) {
+	ctx.Data["Title"] = ctx.Tr("repo.settings.githooks")
+	ctx.Data["PageIsSettingsGitHooks"] = true
+
+	hooks, err := ctx.Repo.GitRepo.Hooks()
+	if err != nil {
+		ctx.ServerError("Hooks", err)
+		return
+	}
+	ctx.Data["Hooks"] = hooks
+
+	ctx.HTML(http.StatusOK, tplGithooks)
+}
+
+// GitHooksEdit render for editing a hook of repository page
+func GitHooksEdit(ctx *context.Context) {
+	ctx.Data["Title"] = ctx.Tr("repo.settings.githooks")
+	ctx.Data["PageIsSettingsGitHooks"] = true
+
+	name := ctx.Params(":name")
+	hook, err := ctx.Repo.GitRepo.GetHook(name)
+	if err != nil {
+		if err == git.ErrNotValidHook {
+			ctx.NotFound("GetHook", err)
+		} else {
+			ctx.ServerError("GetHook", err)
+		}
+		return
+	}
+	ctx.Data["Hook"] = hook
+	ctx.HTML(http.StatusOK, tplGithookEdit)
+}
+
+// GitHooksEditPost response for editing a git hook of a repository
+func GitHooksEditPost(ctx *context.Context) {
+	name := ctx.Params(":name")
+	hook, err := ctx.Repo.GitRepo.GetHook(name)
+	if err != nil {
+		if err == git.ErrNotValidHook {
+			ctx.NotFound("GetHook", err)
+		} else {
+			ctx.ServerError("GetHook", err)
+		}
+		return
+	}
+	hook.Content = ctx.FormString("content")
+	if err = hook.Update(); err != nil {
+		ctx.ServerError("hook.Update", err)
+		return
+	}
+	ctx.Redirect(ctx.Repo.RepoLink + "/settings/hooks/git")
+}