Drop a few unsupported campaigns.

Probably more coming but these are the ones that are confirmed not
happening before release.

(cherry picked from commit 94f65d8f7082e9faa619d7e228e79af85b23b8fc)

resources/campaigns/around_the_mountain.json

@@ -1,11 +0,0 @@
-{
-  "name": "Caucasus - Around The Mountain",
-  "theater": "Caucasus",
-  "authors": "Dillie",
-  "recommended_player_faction": "Russia 2010",
-  "recommended_enemy_faction": "USA 1990",
-  "description": "<p>Scenario from Russia to Georgia in two Frontlines.</p>",
-  "version": "8.0",
-  "miz": "around_the_mountain.miz",
-  "performance": 2
-}

resources/campaigns/humble_helper.json

@@ -1,11 +0,0 @@
-{
-  "name": "Syria - Humble Helper",
-  "theater": "Syria",
-  "authors": "Headiii",
-  "recommended_player_faction": "Israel 2012'ish",
-  "recommended_enemy_faction": "Syria 2012'ish",
-  "description": "<p>In this scenario, you start in Israel in an high intensity conflict with Syria, backed by a Russian Expeditiary Force. Your goal is to take the heavily fortified city of Damascus, as fast as you can. The longer you wait, the more resources the enemy can pump into the defense of the city or even might try to take chunks of Israel. ATTENTION: CAMPAIGN INVERTING IS NOT YET IMPLEMENTED!!! Feedback: @Headiii in the DCSLiberation Discord</p>",
-  "miz": "humble_helper.miz",
-  "performance": 1,
-  "version": "8.0"
-}