fix(theme): standardize README file naming to lowercase

Updated the README file references in both the submit-theme script and the create-theme workflow to use a lowercase naming convention. This change ensures consistency across the project and prevents potential issues with case sensitivity on different operating systems.

.github/scripts/submit-theme.py

@@ -7,13 +7,13 @@
 import urllib.parse
 
 STYLES_FILE = "styles.css"
-README_FILE = "README.md"
+README_FILE = "readme.md"
 IMAGE_FILE = "image.png"
 CONFIG_FILE = "config.yml"
 
 TEMPLATE_STYLES_FILE = "./styles.css"
 TEMPLATE_CONFIG_FILE = "./config.yml"
-TEMPLATE_README_FILE = "./README.md"
+TEMPLATE_README_FILE = "./readme.md"
 
 def create_theme_id():
     return str(uuid.uuid4())

.github/workflows/create-theme.yml

@@ -53,7 +53,7 @@ jobs:
         uses: "DamianReeves/write-file-action@master"
         with:
           contents: ${{ fromJson(steps.issue-parser.outputs.jsonString)['readme'] }}
-          path: README.md
+          path: readme.md
 
       - name: Setup Git
         run: |