feat: deduplicate desktop entries

We don't want duplicate entries because there are not distinguishable by Name.

People will sometimes override in there HOME dir some desktop files entries
in order to do some modifications.

The actual reading order is good and so `unique_by` name do the job.

Cargo.lock

@@ -152,6 +152,12 @@ version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "88d7ed2934d741c6b37e33e3832298e8850b53fd2d2bea03873375596c7cea4e"
 
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -185,6 +191,15 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9a9d19fa1e79b6215ff29b9d6880b706147f16e9b1dbb1e4e5947b5b02bc5e3"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.7"
@@ -791,6 +806,7 @@ dependencies = [
  "dlib",
  "fontconfig",
  "fuzzy-matcher",
+ "itertools",
  "lazy_static",
  "libpulse-binding",
  "memmap",