Silence intentional duplicate-link lint warnings, make awesome-lint blocking

Back-to-top (#contents) links and repeated core-domain links
(robotframework.org, robocon.io) are intentional list conventions;
suppress remark-lint:double-link for them via inline lint-disable
comment instead of ignoring all lint output. awesome-lint now passes
clean, so drop continue-on-error to make it a real gate.

Author: MobyNL

.github/workflows/ci.yml

@@ -33,8 +33,4 @@ jobs:
             README.md
           fail: true
       - name: Check awesome-list conventions
-        # Informational only: the list intentionally keeps some conventions
-        # awesome-lint disagrees with (back-to-top links, repeated domain
-        # links across sections), so this doesn't block merges yet.
-        continue-on-error: true
         run: npx --yes awesome-lint

README.md

@@ -1,3 +1,6 @@
+<!--lint disable double-link-->
+<!-- Repeated "back to top" (#contents) and core-domain links (robotframework.org, robocon.io) are intentional. -->
+
 # Awesome Robot Framework [![Awesome](https://awesome.re/badge.svg)](https://awesome.re)
 
 [![License: CC BY-NC-SA 4.0](https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by-nc-sa/4.0/)
@@ -7,6 +10,7 @@
 
 > A curated list of awesome Robot Framework resources and libraries
 
+
 Entries marked *No updates since YYYY.* have had no commits or releases for at least three years; *Archived; no updates since YYYY.* means the upstream repository is archived. They stay listed because they may still work or serve as a reference, but expect no support.
 
 ## Contents