ci(links): exclude GitHub stargazers/network-members from link check (#358)

GitHub returns 404 for /stargazers and /network/members to anonymous clients
(anti-scraping); the README social-footer badges link there, so the lychee link
check (the non-blocking ci.yml job and the standalone links.yml, both using this
config) flagged them as dead. The pages are live in a browser. Exclude them.

lychee.toml

@@ -17,6 +17,9 @@ exclude_all_private = true
 # check time):
 # - crates.io and npmjs.com return 403/404 to non-browser requests
 #   (anti-scraping); the package pages are live in a browser.
+# - GitHub serves 404 for /stargazers and /network/members to anonymous clients
+#   (anti-scraping). The README social-footer badges link there; the pages are
+#   live in a browser.
 # - the CHANGELOG version-compare links point at the release tag that is created
 #   *after* the bump is merged. ci.yml runs on push/PR (never on the tag), so the
 #   tag never exists when lychee runs and the compare URL 404s. One pattern
@@ -25,4 +28,6 @@ exclude = [
   'crates\.io/crates/',
   'www\.npmjs\.com/package/',
   'github\.com/wickra-lib/wickra/compare/',
+  'github\.com/wickra-lib/wickra/stargazers',
+  'github\.com/wickra-lib/wickra/network/members',
 ]