[paperless-ngx] Chart Update

[mvprowess]

Version path: 2.10.1* → 2.5.0 env vars → 2.9.0 → 2.18.0 → 2.20.13

Existing Issues:

• examine currently documented environment variables to evaluate whether PAPERLESS_REDIRECT_LOGIN_TO_SSO is still used and supported. if so add the support for it as descirbed in [paperless-ngx] Missing configuration option #35

*Current appVersion is 2.10.1 but artifacthub.io/images incorrectly references 2.4.0 — fix both atomically.

• 2.5.0 added OIDC/social auth (high-demand for K8s users)
• 2.9.0 added scheduled workflow cron config
• 2.18.0 enforces PostgreSQL 14 minimum and adds DB connection pool config
• 2.20.7 security fix restricts filename template context — users with custom PAPERLESS_FILENAME_FORMAT should run document_renamer after upgrading
• 2.20.x series has 8+ security CVE fixes — all users should update promptly

Changes required (fix annotation first, then chronological):

• (Fix first) Correct artifacthub.io/images from 2.4.0 → 2.20.13 and align appVersion
• 2.5.0 — Add OIDC/social auth section: PAPERLESS_APPS, PAPERLESS_SOCIALACCOUNT_PROVIDERS, PAPERLESS_SOCIAL_AUTO_SIGNUP, PAPERLESS_SOCIALACCOUNT_ALLOW_SIGNUPS, PAPERLESS_ACCOUNT_ALLOW_SIGNUPS, PAPERLESS_DISABLE_REGULAR_LOGIN, PAPERLESS_REDIRECT_LOGIN_TO_SSO
• 2.6.0–2.8.x — Add SMTP email section: PAPERLESS_EMAIL_HOST/PORT/HOST_USER/HOST_PASSWORD/USE_TLS/USE_SSL; add PAPERLESS_AUDIT_LOG_ENABLED
• 2.9.0 — Add PAPERLESS_WORKFLOW_SCHEDULE_CRON
• 2.11.0–2.13.x — Add PAPERLESS_ACCOUNT_SESSION_REMEMBER, PAPERLESS_SESSION_COOKIE_AGE
• 2.18.0 — Add PAPERLESS_DB_CONNECTION_POOL_SIZE; ensure bundled PostgreSQL subchart is version 14+
• Add note to README/NOTES.txt about 2.20.7 filename template restriction: users with custom PAPERLESS_FILENAME_FORMAT should run document_renamer after upgrading
• Verify bitnami/postgresql and bitnami/redis subchart image overrides are in place (covered by General Changes issue)
• Bump appVersion and image tag to 2.20.13
• Bump chart version to 1.0.0