updated README.md

README.md

@@ -5,7 +5,7 @@ CSST L1 pipeline prototype.
 
 ## homepage
 
-This code is available on *CSST GitLab*:
+This code is available at *CSST GitLab*:
 - [https://csst-tb.bao.ac.cn/code/csst-l1/csst_proto](https://csst-tb.bao.ac.cn/code/csst-l1/csst_proto).
 
 ## documentation
@@ -76,7 +76,7 @@ The `csst_proto` uses an awesome algorithm based on `numpy.ndarray` indices to f
 4. gitlab CI/CD pipeline: `.gitlab-ci.yml`
 5. sphinx-based documentation: `doc/` & `readthedocs.yml`
 
-## necessary skills
+## useful links
 
 - git: https://git-scm.com/
   - Pro Git: https://git-scm.com/book/en/v2
@@ -86,4 +86,5 @@ The `csst_proto` uses an awesome algorithm based on `numpy.ndarray` indices to f
 - unittest: https://docs.python.org/3.8/library/unittest.html
 - sphinx: https://www.sphinx-doc.org/en/master/index.html
 - restructured text: https://docutils.sourceforge.io/rst.html
-- readthedoc: https://readthedocs.io/ or https://rtfd.io/
\ No newline at end of file
+- readthedoc: https://readthedocs.io/ or https://rtfd.io/
+- 
\ No newline at end of file