Bitbucket Server: add OAuth2 docs

[glaubinix]

No description provided.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 43.4%, saving 2.47 MB.

Filename	Before	After	Improvement	Visual comparison
Resources/public/img/docs/bitbucket-server-oauth1-01-packagist-setup.png	296.42 KB	161.35 KB	-45.6%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-01-packagist-setup.png	478.21 KB	268.33 KB	-43.9%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-02-bitbucket-create-application-link.png	466.95 KB	250.43 KB	-46.4%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-03-bitbucket-configure-application-link.png	478.32 KB	251.78 KB	-47.4%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-04-packagist-finalize.png	486.92 KB	274.90 KB	-43.5%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-oauth1-01-packagist-setup.png	296.48 KB	162.28 KB	-45.3%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-oauth1-02-packagist-form.png	807.02 KB	474.58 KB	-41.2%	View diff
Resources/public/img/docs/integration-setup/bitbucket-server-oauth1-08-packagist-finalize.png	805.09 KB	472.82 KB	-41.3%	View diff
Resources/public/img/docs/integration-setup/cloud/bitbucket-server-01-packagist-setup.png	504.75 KB	282.27 KB	-44.1%	View diff
Resources/public/img/docs/integration-setup/cloud/bitbucket-server-oauth1-01-packagist-setup.png	325.15 KB	179.75 KB	-44.7%	View diff
Resources/public/img/docs/integration-setup/cloud/bitbucket-server-oauth1-02-packagist-details.png	878.13 KB	519.04 KB	-40.9%	View diff

63 images did not require optimisation.