chore: add more extensions (#1042)

Signed-off-by: Valeriy Svydenko <[email protected]>

dependencies/che-plugin-registry/openvsx-sync.json

@@ -2,6 +2,24 @@
     {
         "id": "donjayamanne.githistory"
     },
+    {
+        "id": "yzane.markdown-pdf"
+    },
+    {
+        "id": "DavidAnson.vscode-markdownlint"
+    },
+    {
+        "id": "robocorp.robotframework-lsp"
+    },
+    {
+        "id": "shardulm94.trailing-spaces"
+    },
+    {
+        "id": "adamhartford.vscode-base64"
+    },
+    {
+        "id": "usernamehw.indent-one-space"
+    },
     {
         "id": "redhat.vscode-xml"
     },