Broken Urls present on the official PostgreSQL website (as reported by the Testing Harness Suite)

Hello everyone,

Our Testing Harness Suite
<https://github.com/destrex271/pgweb-testing-harness/actions/runs/5647803781>
(being developed under GSoC'23) has found some broken links on the official
postgresql website. I am attaching the logs generated below.

The broken links present in the log file attached below are:

--- Links to external sites -----
1. https://www.postgresql.org/docs/current/static/pgstandby.html : 404 : On
Page https://www.postgresql.org/about/featurematrix/
2. https://www.postgresql.org/docs/current/static/tsearch2.html : 404 : On
Page https://www.postgresql.org/about/featurematrix/
3. https://formulae.brew.sh/formula/postgresql : 404 : On Page
https://www.postgresql.org/download/macosx/
4. http://www.digitbooks.fr/catalogue/9782815001984.html : 404 : On Page
https://www.postgresql.org/docs/books/
5. http://www.digitbooks.fr/catalogue/9782815001809.html : 404 : On Page
https://www.postgresql.org/docs/books/
6.
https://www.editions-eni.fr/Livres/PostgreSQL---administration-et-exploitation-d-rsquoune-base-de-donnees-2eme-edition-/.4_3a6222cf-b921-41f5-886c-c989f77ba994_710d51ac-760b-4aeb-a66a-55d146b69983_1_0_d9bd8b5e-f324-473f-b1fc-b41b421c950f.html
: 404 : On Page https://www.postgresql.org/docs/books/
7. https://www.commandprompt.com/ppbook/ : 404 : On Page
https://www.postgresql.org/docs/books/

If you wish to see all the logs kindly visit this page
<https://github.com/destrex271/pgweb-testing-harness/actions/runs/5647803781>.

If you want to know more about the testing harness suite yourself on your
local machine kindly visit here
<https://github.com/destrex271/pgweb-testing-harness#readme>.
Would like to encourage everyone to use the Testing Harness to check for
any errors in the latest builds of the official website.

Regards,
Akshat Jaimini