Removes releases < v0.20 (#1416)

* removes core changelogs > 20

* removes Core upgrade guides < v0.20

* removes enterprise changelogs < v0.20

* removes enterprise changelogs < v0.20

* reverts 8ed8bd9

* Revert "removes enterprise changelogs < v0.20"

This reverts commit ee2d287.

* Revert "removes Core upgrade guides < v0.20"

This reverts commit d2f501e.

* Revert "removes core changelogs > 20"

This reverts commit 1dccedc.

* removes archived versions < v0.20

Author: ZPain8464

src/components/docVersions.json

@@ -30,45 +30,5 @@
   "0.20.0": {
     "id": "v0.20.x",
     "link": "https://0-20-0.docs.pomerium.com/docs"
-  },
-  "0.19.0": {
-    "id": "v0.19.x",
-    "link": "https://0-19-0.docs.pomerium.com/docs"
-  },
-  "0.18.0": {
-    "id": "v0.18.x",
-    "link": "https://0-18-0.docs.pomerium.com/docs"
-  },
-  "0.17.0": {
-    "id": "v0.17.x",
-    "link": "https://0-17-0.docs.pomerium.com/docs"
-  },
-  "0.16.0": {
-    "id": "v0.16.x",
-    "link": "https://0-16-0.docs.pomerium.com/docs"
-  },
-  "0.15.0": {
-    "id": "v0.15.x",
-    "link": "https://0-15-0.docs.pomerium.com/docs"
-  },
-  "0.14.0": {
-    "id": "v0.14.x",
-    "link": "https://0-14-0.docs.pomerium.com/docs"
-  },
-  "0.13.0": {
-    "id": "v0.13.x",
-    "link": "https://0-13-0.docs.pomerium.com/docs"
-  },
-  "0.12.0": {
-    "id": "v0.12.x",
-    "link": "https://0-12-0.docs.pomerium.com/docs"
-  },
-  "0.11.0": {
-    "id": "v0.11.x",
-    "link": "https://0-11-0.docs.pomerium.com/docs"
-  },
-  "0.10.0": {
-    "id": "v0.10.x",
-    "link": "https://0-10-0.docs.pomerium.com/docs"
   }
 }