CI: update CI documentation and other minor improvements #245

Annotations

9 errors and 3 warnings

failed 1/13 goals-after-auto (0.419957 sec)

failed 2/13 goals-after-comment (0.314932 sec)

failed 3/13 goals-after-error (0.331317 sec)

failed 4/13 goals-after-proof (0.321159 sec)

failed 8/13 goals-reset-qed (0.315605 sec)

failed 11/13 goals-up-to-date-at-error (0.325936 sec)

failed 12/13 goals-updated-after-check-many-steps (0.339490 sec)

failed 13/13 goals-updated-after-search-many-steps (0.333036 sec)

failed 1/2 proof-check-correct-stat (0.959591 sec)

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Failed to remove 'http.https://github.com/.extraheader' from the git config