fix: rewrite meta image link

[tripodsan]

fixes #604

new behaviour:

• absolute links to internal images (to hlx.page/hlx.live) are now rewritten to use the configured production host and include image optimizer parameters. eg:

+---------------------------------------------------------------------------------------------------+
| Metadata                                                                                          |
+------------------+--------------------------------------------------------------------------------+
| Image            | <https://main--helix-pages--adobe.hlx.page/images/meta/default-meta-image.png> |
+------------------+--------------------------------------------------------------------------------+

from: <meta property="og:image" content="https://main--helix-pages--adobe.hlx.page/images/meta/default-meta-image.png">

to: <meta property="og:image" content="https://example.com/images/meta/default-meta-image.png?width=1200&#x26;format=pjpg&#x26;optimize=medium">

[github-actions[bot]]

This PR will trigger a patch release when merged.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (f3cffb1) to head (d5d1828). Report is 1 commits behind head on 5.x.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 5.x #615 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 50 50 Lines 4420 4422 +2 ========================================= + Hits 4420 4422 +2 ```

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:tada: This PR is included in version 5.11.2 :tada:

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