Add Diagrams.net icon (#4310)

* Added Diagrams.net icon

* Updated Diagrams.net hex to fix linting

* Set precision to 5 - still not perfect

* Did not include correct annotations

* Corrected logo to icon

* Utilized SVGO Command Line Tool - Default Precision

* Used @service-paradis' path output

* Updated from Diagrams.net to diagrams.net - reflects naming convention better.

* Updated SVG title tag

_data/simple-icons.json

@@ -1669,8 +1669,11 @@
             "title": "DHL",
             "hex": "FFCC00",
             "source": "https://www.dpdhl-brands.com/dhl/en/guides/design-basics/logo-and-claim.html"
-        },
-        {
+        }, {
+            "title": "diagrams.net",
+            "hex": "F08705",
+            "source": "https://github.com/jgraph/drawio/blob/4743eba8d5eaa497dc003df7bf7295b695c59bea/src/main/webapp/images/drawlogo.svg"
+        }, {
             "title": "Diaspora",
             "hex": "000000",
             "source": "https://wiki.diasporafoundation.org/Branding"

icons/diagrams-dot-net.svg

@@ -0,0 +1 @@
+<svg role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><title>diagrams.net icon</title><path d="M19.69 13.419h-2.527l-2.667-4.555a1.292 1.292 0 001.035-1.28V4.16c0-.725-.576-1.312-1.302-1.312H9.771c-.726 0-1.312.576-1.312 1.301v3.435c0 .619.426 1.152 1.034 1.28l-2.666 4.555H4.309c-.725 0-1.312.576-1.312 1.301v3.435c0 .725.576 1.312 1.302 1.312h4.458c.726 0 1.312-.576 1.312-1.302v-3.434c0-.726-.576-1.312-1.301-1.312h-.437l2.645-4.523h2.059l2.656 4.523h-.438c-.725 0-1.312.576-1.312 1.301v3.435c0 .725.576 1.312 1.302 1.312H19.7c.726 0 1.312-.576 1.312-1.302v-3.434c0-.726-.576-1.312-1.301-1.312zM24 22.976c0 .565-.459 1.024-1.013 1.024H1.024A1.022 1.022 0 010 22.987V1.024C0 .459.459 0 1.013 0h21.963C23.541 0 24 .459 24 1.013z"/></svg>