Basic accounts

- add account link in welcome.html
- add AuthorizeExchangeSpec adminPaths in SecurityConfiguration
- add AccountController
- add users.html
- add getAccounts in AccountRegistryService
- add WebClient accountRegistryAccounts in webClient

src/main/kotlin/ltd/hlaeja/controller/AccountController.kt

@@ -0,0 +1,30 @@
+package ltd.hlaeja.controller
+
+import ltd.hlaeja.service.AccountRegistryService
+import org.springframework.stereotype.Controller
+import org.springframework.ui.Model
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import reactor.core.publisher.Mono
+
+@Controller
+@RequestMapping("/account")
+class AccountController(
+    private val accountRegistryService: AccountRegistryService,
+) {
+
+    @GetMapping
+    fun getAccounts(
+        @RequestParam(defaultValue = "1") page: Int,
+        @RequestParam(defaultValue = "2") size: Int,
+        model: Model,
+    ): Mono<String> = accountRegistryService.getAccounts(page, size)
+        .collectList()
+        .doOnNext { items ->
+            model.addAttribute("items", items)
+            model.addAttribute("page", page)
+            model.addAttribute("size", size)
+        }
+        .then(Mono.just("account/users"))
+}