Inline the submodule of themes/hermit with a git-subtree

Add 'themes/hermit/' from commit '56843f347a642324970ba30d58f23c64e037bb7c'

git-subtree-dir: themes/hermit
git-subtree-mainline: 7844fa5501c271b1b2b5ece2cb19f3202cd6e5ad
git-subtree-split: 56843f347a

flake.lock

@@ -1,22 +1,5 @@
 {
   "nodes": {
-    "hermit": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1622561639,
-        "narHash": "sha256-Zw/+3EE6DAQ4NS1i22vadXwDEo6CnJkByy7IpdGuRYM=",
-        "owner": "vojta001",
-        "repo": "hermit",
-        "rev": "56843f347a642324970ba30d58f23c64e037bb7c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "vojta001",
-        "ref": "tmp",
-        "repo": "hermit",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1662096612,
@@ -35,7 +18,6 @@
     },
     "root": {
       "inputs": {
-        "hermit": "hermit",
         "nixpkgs": "nixpkgs"
       }
     }