schema: remove all additionalItems

they are of no use in the latest JSON Schema reference, see: https://json-schema.org/understanding-json-schema/reference/array.html

> The items keyword can be used to control whether it’s valid to have additional items in a tuple beyond what is defined in prefixItems. The value of the items keyword is a schema that all additional items must pass in order for the keyword to validate.
> Before to Draft 2020-12, you would use the additionalItems keyword to constrain additional items on a tuple. It works the same as items, only the name has changed.
> In Draft 6 - 2019-09, the additionalItems keyword is ignored if there is not a "tuple validation" items keyword present in the same schema.

schema/jsoncv.schema.json

@@ -74,7 +74,6 @@
         "profiles": {
           "type": "array",
           "description": "Specify any number of social networks that you participate in",
-          "additionalItems": false,
           "items": {
             "type": "object",
             "additionalProperties": true,
@@ -99,7 +98,6 @@
     },
     "work": {
       "type": "array",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -138,7 +136,6 @@
           "highlights": {
             "type": "array",
             "description": "Specify multiple accomplishments",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. Increased profits by 20% from 2011-2012 through viral advertising"
@@ -149,7 +146,6 @@
     },
     "volunteer": {
       "type": "array",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -180,7 +176,6 @@
           "highlights": {
             "type": "array",
             "description": "Specify accomplishments and achievements",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. Increased profits by 20% from 2011-2012 through viral advertising"
@@ -191,7 +186,6 @@
     },
     "education": {
       "type": "array",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -226,7 +220,6 @@
           "courses": {
             "type": "array",
             "description": "List notable courses/subjects",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. H1302 - Introduction to American history"
@@ -238,7 +231,6 @@
     "awards": {
       "type": "array",
       "description": "Specify any awards you have received throughout your professional career",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -264,7 +256,6 @@
     "certificates": {
       "type": "array",
       "description": "Specify any certificates you have received throughout your professional career",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -293,7 +284,6 @@
     "publications": {
       "type": "array",
       "description": "Specify your publications through your career",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -324,7 +314,6 @@
     "skills": {
       "type": "array",
       "description": "List out your professional skill-set",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -340,7 +329,6 @@
           "keywords": {
             "type": "array",
             "description": "List some keywords pertaining to this skill",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. HTML"
@@ -352,7 +340,6 @@
     "languages": {
       "type": "array",
       "description": "List any other languages you speak",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -370,7 +357,6 @@
     },
     "interests": {
       "type": "array",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -381,7 +367,6 @@
           },
           "keywords": {
             "type": "array",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. Friedrich Nietzsche"
@@ -393,7 +378,6 @@
     "references": {
       "type": "array",
       "description": "List references you have received",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -412,7 +396,6 @@
     "projects": {
       "type": "array",
       "description": "Specify career projects",
-      "additionalItems": false,
       "items": {
         "type": "object",
         "additionalProperties": true,
@@ -428,7 +411,6 @@
           "highlights": {
             "type": "array",
             "description": "Specify multiple features",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. Directs you close but not quite there"
@@ -437,7 +419,6 @@
           "keywords": {
             "type": "array",
             "description": "Specify special elements involved",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. AngularJS"
@@ -457,7 +438,6 @@
           "roles": {
             "type": "array",
             "description": "Specify your role on this project or in company",
-            "additionalItems": false,
             "items": {
               "type": "string",
               "description": "e.g. Team Lead, Speaker, Writer"