Remove error messages that can't occur on v7

See bblanchon/ArduinoJson#2043

src/pages/v7/compiletime/index.md

@@ -78,7 +78,7 @@ options:
   no-matching-function:
     label: no matching function for call to ...
     summary: Error says "no matching function for call to ..."
-    page: /v6/compiletime/no-matching-function/index.md
+    page: no-matching-function.md
 
   passing-volatile-as-this-argument-discards-qualifiers:
     label: passing `volatile ...` as `this` argument discards qualifiers [-fpermissive]

src/pages/v7/compiletime/no-matching-function.md

@@ -0,0 +1,39 @@
+---
+options:
+  basicjsondocument:
+    label: no matching function for call to `BasicJsonDocument::BasicJsonDocument()`
+    summary: Error says "no matching function for call to `BasicJsonDocument::BasicJsonDocument()`"
+    page: /v6/compiletime/no-matching-function/basicjsondocument.md
+
+  converttojson:
+    label: no matching function for call to `convertToJson(...)`
+    summary: Error says "no matching function for call to `convertToJson(...)`"
+    page: /v6/compiletime/no-matching-function/converttojson.md
+
+  deserializejson:
+    label: no matching function for call to `deserializeJson(StaticJsonDocument<200> (&)(), ...)`
+    summary: Error says "no matching function for call to `deserializeJson(StaticJsonDocument<200> (&)(), ...)`"
+    page: /v6/compiletime/no-matching-function/deserializejson.md
+
+  unresolved-overloaded-function-type:
+    label: no matching function for call to `...(<unresolved overloaded function type>)`
+    summary: Error says "no matching function for call to `...(<unresolved overloaded function type>)`"
+    page: /v6/compiletime/no-matching-function/unresolved-overloaded-function-type.md
+
+  add-jsonarray:
+    label: no matching function for call to `...add<JsonArray>()`
+    summary: Error says "no matching function for call to `...add<JsonArray>()`"
+    page: /v6/compiletime/no-matching-function/add-jsonarray.md
+
+  add-jsonobject:
+    label: no matching function for call to `...add<JsonObject>()`
+    summary: Error says "no matching function for call to `...add<JsonObject>()`"
+    page: /v6/compiletime/no-matching-function/add-jsonobject.md
+
+  not-in-list:
+    label: None of the above
+    summary:  The error is not in the list
+    page: /unknown-error.md
+---
+
+Which error is it?