add sastorsl as a contributor for content

[allcontributors]

Adds @sastorsl as a contributor for content.

This was requested by sspencerwire in this comment

[skip ci]

[github-actions]

Test results for 4dda220:

Number of broken URLs: 12

URL,RESULT,FILENAME
 https://reddit.com/r/rockylinux,failed,release_notes/8_6.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_0.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_5.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_9.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_7.md
 https://reddit.com/r/rockylinux,failed,release_notes/8_8.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_2.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_1.md
 https://reddit.com/r/rockylinux,failed,release_notes/9_3.md
 http://planet.i2p,failed,guides/proxies/i2pd.md
 http://nextcloud.yourdomain.com/,failed,guides/cms/cloud_server_using_nextcloud.md
 https://www.yourdomain.com/,failed,guides/security/generating_ssl_keys_lets_encrypt.md