Check_links issue: Errors in the 404.html file

[chrisb13]

@atteggiani this is just a placeholder so we don't forget about this "Errors in the 404.html file" issue...

As previously discussed...

can you please have a glance at the remaining ones:

Details

### Errors in /home/runner/work/decoding-om3/decoding-om3/docs_folder/404.html

Error: * [ERROR] error: | Error building URL for "/." (Attribute: Some("href")): Cannot convert path '/.' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/." (Attribute: Some("href")): Cannot convert path '/.' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/." (Attribute: Some("href")): Cannot convert path '/.' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/AOMSS_Lecture_Notes/" (Attribute: Some("href")): Cannot convert path '/AOMSS_Lecture_Notes/' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/assets/ACCESS_icon_HIVE.png" (Attribute: Some("href")): Cannot convert path '/assets/ACCESS_icon_HIVE.png' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/assets/ACCESS_icon_HIVE.png" (Attribute: Some("src")): Cannot convert path '/assets/ACCESS_icon_HIVE.png' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/assets/ACCESS_icon_HIVE.png" (Attribute: Some("src")): Cannot convert path '/assets/ACCESS_icon_HIVE.png' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/assets/stylesheets/main.4af4bdda.min.css" (Attribute: Some("href")): Cannot convert path '/assets/stylesheets/main.4af4bdda.min.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/assets/stylesheets/palette.06af60db.min.css" (Attribute: Some("href")): Cannot convert path '/assets/stylesheets/palette.06af60db.min.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/css/custom.css" (Attribute: Some("href")): Cannot convert path '/css/custom.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/fontello/css/fontello-codes.css" (Attribute: Some("href")): Cannot convert path '/fontello/css/fontello-codes.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/fontello/css/fontello-ie7-codes.css" (Attribute: Some("href")): Cannot convert path '/fontello/css/fontello-ie7-codes.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/fontello/css/fontello-ie7.css" (Attribute: Some("href")): Cannot convert path '/fontello/css/fontello-ie7.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/fontello/css/fontello.css" (Attribute: Some("href")): Cannot convert path '/fontello/css/fontello.css' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/season1/" (Attribute: Some("href")): Cannot convert path '/season1/' to a URI: To resolve root-relative links in local files, provide a root dir
Error: * [ERROR] error: | Error building URL for "/season2/" (Attribute: Some("href")): Cannot convert path '/season2/' to a URI: To resolve root-relative links in local files, provide a root dir

And then previously from @atteggiani ...

For the errors in the 404.html file, please disregard them for the moment.
I'm not sure why they are happening.

They might be related to the resolve-absolute-urls plugin not being run at build time, but I'm not yet sure why that is happening.