feat: flip include-forks / include-private defaults to true

Most users reach for ghstats to show their real activity. Making the
two visibility toggles opt-out rather than opt-in gives accurate stats
out of the box.

- -include-forks        false → true
- -include-private      false → true
- include_forks input   false → true
- include_private input false → true

Private-repo data silently no-ops when the token lacks repo scope, so
the default is safe for default github.token runs — it just won't
surface more than read:user already allows. Users who want the old
public-only behavior pass -include-private=false or set the Action
input to "false".

entrypoint.sh

@@ -13,8 +13,8 @@ themes="${INPUT_THEMES:-dracula}"
 tz="${INPUT_TZ:-UTC}"
 top_repos="${INPUT_TOP_REPOS:-0}"
 commits_per_repo="${INPUT_COMMITS_PER_REPO:-500}"
-include_forks="${INPUT_INCLUDE_FORKS:-false}"
-include_private="${INPUT_INCLUDE_PRIVATE:-false}"
+include_forks="${INPUT_INCLUDE_FORKS:-true}"
+include_private="${INPUT_INCLUDE_PRIVATE:-true}"
 commit_changes="${INPUT_COMMIT_CHANGES:-false}"
 commit_message="${INPUT_COMMIT_MESSAGE:-chore: update ghstats cards}"
 commit_branch="${INPUT_COMMIT_BRANCH:-}"