Enh. cards title & description extract

[adriendupuis]

Question	Answer
JIRA Ticket	N/A
Versions	master, 4.6
Edition	N/A

Enhance main.py cards function to handle more title and description extraction cases.

While www.ibexa.co uses Open Graph, doc.ibexa.co doesn't but uses "regular" title and description metadata.
Open Graph metadata stays the favorite as made for sharing, but if absent, <title>…</title> and <meta name="description" content="…"> are the potential fallbacks.

Test

Successfully tested locally with the following in editions.md:

[[= cards([
"ibexa_products/headless",
"ibexa_products/experience",
"https://www.ibexa.co/products/ibexa-commerce",
"https://doc.ibexa.co/projects/connect/en/latest/general/ibexa_connect/",
"https://doc.ibexa.co/en/latest/tutorials/beginner_tutorial/beginner_tutorial/"
], columns=3) =]]

(https://doc.ibexa.co/projects/connect/en/latest/general/ibexa_connect/ doesn't have any description whatever format/syntax. And Connect doc has the same page title everywhere.)

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR

[mnocon]

Thanks!