monographs: add slug field which regenerates on republish (#72)

* monographs: add slug field which regenerates on update

* monographs: don't regenerate slug on update

* common: fix monograph public url constant

* monographs: improve APIs && use .Project when fetching monographs
* create separate endpoint for fetching monographs by slug
* combine analytics and publish-url endpoint into a publish-info endpoint

* monographs: reinstate analytics endpoint

* common: add missing monograph constant

* monograph: refactoring

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Co-authored-by: Abdullah Atta <abdullahatta@streetwriters.co>

Notesnook.API/Models/Monograph.cs

@@ -56,6 +56,9 @@ namespace Notesnook.API.Models
         [JsonPropertyName("title")]
         public string? Title { get; set; }
 
+        [JsonPropertyName("slug")]
+        public string? Slug { get; set; }
+
         [JsonPropertyName("userId")]
         public string? UserId { get; set; }