formatting: fix table of contents (#100)

This fixes spacing between entries in the table of contents

Current: https://gitea.com/gitea/awesome-gitea#contents.
Fixed: https://gitea.com/nodiscc/awesome-gitea/src/branch/cleanup-toc#contents

Co-authored-by: nodiscc <nodiscc@gmail.com>
Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/100
Reviewed-by: John Olheiser <john+gitea@jolheiser.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: nodiscc <nodiscc@noreply.gitea.io>
Co-committed-by: nodiscc <nodiscc@noreply.gitea.io>

README.md

@@ -12,25 +12,15 @@ A curated list of awesome projects related to Gitea.
     - [DevOps](#devops)
     - [Mobile](#mobile)
     - [Panel](#panel)
-
 - [Migration](#migration)
-
 - [Organizations](#organizations)
-
 - [Packages](#packages)
-
 - [Package Management](#package-management)
-
 - [Plugins](#plugins)
-
 - [Scripts](#scripts)
-
 - [SDK](#sdk)
-
 - [Themes](#themes)
-
 - [Workflow Tools](#workflow-tools)
-
 - [Project Management](#project-management)
 
 ## Applications