[ImgBot] Optimize images (#3405)

*Total -- 3,340.79kb -> 2,604.58kb (22.04%)

/Website/docs/img/arp-table-entry.png -- 70.78kb -> 37.28kb (47.33%)
/Website/docs/img/firewall-rule.png -- 85.01kb -> 45.16kb (46.88%)
/Website/blog/2026-04-30-introducing-firewall/firewall-rule.png -- 85.01kb -> 45.16kb (46.88%)
/Website/docs/img/hosts-file-editor-entry.png -- 65.39kb -> 35.45kb (45.78%)
/Website/blog/2026-04-30-introducing-firewall/firewall.png -- 71.27kb -> 39.76kb (44.21%)
/Website/docs/img/firewall.png -- 71.27kb -> 39.76kb (44.21%)
/Website/static/img/preview-profiles.gif -- 2,892.06kb -> 2,362.02kb (18.33%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>
Co-authored-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: imgbot[bot]