docs: consolidate README links for BitbucketServer2Gitea integration

- Add a link to `BitbucketServer2Gitea` in the README
- Remove a duplicate link to `BitbucketServer2Gitea` in the README

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -96,12 +96,12 @@ A curated list of awesome projects related to Gitea and its soft-fork instances.
 
 ## Migration
 
+- [BitbucketServer2Gitea](https://github.com/appleboy/BitbucketServer2Gitea) - A command line tool build with Golang to migrate a Bitbucket Server (Stash) Project to Gitea.
 - [Bitbucket2Gitea](https://github.com/sIspravnikov/BitbucketToGitea) - A python3 script to migrate all projects and repositories from Atlassian BitBucket to Gitea.
 - [github2gitea](https://gitea.com/yige/github2gitea) - A python script to migrate Github repositories Gitea with issues/prs/wiki and etc.
 - [gitlab2gitea](https://github.com/cornelk/gitlab2gitea) - A command line tool build with Golang to migrate a GitLab project to Gitea.
 - [Gogs2Gitea](https://github.com/lesh59/Gogs2Gitea) - A SQL script and process (README) to migrate directly from Gogs 0.12.3 to Gitea 1.12.5 / 1.12.6 in MySQL/MariaDB and maybe other DB's.
 - [jira2giteaMySql](https://github.com/juangarcia06/jira2giteaMySql) Jira Issues to Gitea (with MySql)
-- [BitbucketServer2Gitea](https://github.com/appleboy/BitbucketServer2Gitea) - A command line tool build with Golang to migrate a Bitbucket Server (Stash) Project to Gitea.
 
 ## Organizations