Clean up implementation schema, etc

Drop github.com and twitter.com/ prefix from user profiles.

Author: ongardie

implementation.schema.json

@@ -1,74 +1,93 @@
 {
     "$schema": "http://json-schema.org/draft-07/schema#",
     "$id": "https://raft.github.io/implementation.schema.json",
-    "title": "Implementation",
-    "description": "...",
+    "title": "Raft Implementation",
+    "description": "This file contains the schema describing a single Raft implementation.",
     "type": "object",
     "properties": {
         "repoURL": {
+            "description": "URL pointing to base GitHub repo.",
             "type": "string",
             "pattern": "^https://github.com/([^/]+)/([^/]+)(?<!.git)$",
             "format": "uri"
         },
         "directory": {
+            "description": "Optional path within Git repo where the Raft implementation is located.",
             "type": "string",
             "pattern": "^[^/].*/$"
         },
         "name": {
+            "description": "Implementation project name. If the project is referred to as 'Raft', disambiguate it.",
             "type": "string",
             "pattern": "^.+(?<!^[Rr][Aa][Ff][Tt])$"
         },
         "authors": {
+            "description": "List of primary authors (people). Try to keep this short.",
             "type": "array",
             "items": {
                 "type": "object",
                 "properties": {
                     "name": {
+                        "description": "Person's name (or alias).",
                         "type": "string"
                     },
                     "twitter": {
+                        "description": "Author's public Twitter username (without the @).",
                         "type": "string",
-                        "pattern": "^https://twitter.com/([^/]+)$",
-                        "format": "uri"
+                        "pattern": "^[A-Za-z0-9_]{1,15}$"
                     },
                     "github": {
+                        "description": "Author's GitHub username.",
                         "type": "string",
-                        "pattern": "^https://github.com/([^/]+)$",
-                        "format": "uri"
+                        "pattern": "^[A-Za-z0-9]([A-Za-z0-9-]{0,37}[A-Za-z0-9]?)$"
                     },
                     "homepage": {
+                        "description": "Author's public home page.",
                         "type": "string",
                         "format": "uri"
+                    },
+                    "organization": {
+                        "description": "The author's affiliation for the project, such as an employer.",
+                        "type": "string"
                     }
-                }
+                },
+                "required": [
+                    "name"
+                ],
+                "additionalProperties": false
             },
             "maxItems": 7
         },
         "language": {
-            "type": "string",
-            "description": "SPDX license expression. See https://spdx.org/licenses/"
+            "description": "Primary programming language for the implementation.",
+            "type": "string"
         },
         "license": {
+            "description": "SPDX license expression describing how the implementation may be used. See https://choosealicense.com/ or https://spdx.org/licenses/.",
             "type": "string"
         },
         "features": {
+            "description": "Describe how complete the implementation is.",
             "type": "object",
             "properties": {
                 "basic": {
-                    "type": "boolean",
-                    "description": "Leader election and log replication"
+                    "description": "The implementation handles leader election and log replication.",
+                    "type": "boolean"
                 },
                 "persistence": {
-                    "type": "boolean",
-                    "description": "Term and log are persisted to disk"
+                    "description": "The implementation safely persists the term and log to disk.",
+                    "type": "boolean"
                 },
                 "logCompaction": {
+                    "description": "The implementation does some form of log compaction, such as snapshotting.",
                     "type": "boolean"
                 },
                 "membershipChanges": {
+                    "description": "The implementation can dynamically change the set of servers safely.",
                     "type": "boolean"
                 }
-            }
+            },
+            "additionalProperties": false
         }
     },
     "required": [