Update link to remove absolute URL
Remove absolute url from override_dir_structure link
Remove absolutes url
Change symfony-docs internal links avoiding absolute urls
Remove unused links
Change symfony-docs internal links avoiding absolute urls in security article
Change symfony-docs internal links avoiding absolute urls in introduction article

 - Removed unused links
minor #4537 Update link to remove absolute URL (jms85, dangarzon)

This PR was merged into the 2.3 branch.

Discussion
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Update link to remove absolute URL

Commits
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7282965 Change symfony-docs internal links avoiding absolute urls in introduction article
ffa17b2 Change symfony-docs internal links avoiding absolute urls in security article
c7f9cf5 Remove unused links
079bd64 Change symfony-docs internal links avoiding absolute urls
cf32b4c Remove absolutes url
ae877f2 Remove absolute url from override_dir_structure link
f7de50e Update link to remove absolute URL