Update to 5.3 directory

diff --git a/site/content/docs/5.2/about/support-bootstrap.md b/site/content/docs/5.3/about/support-bootstrap.md
similarity index 100%
rename from site/content/docs/5.2/about/support-bootstrap.md
rename to site/content/docs/5.3/about/support-bootstrap.md

diff --git a/site/static/docs/5.2/assets/img/bootstrap-sponsoring.png b/site/static/docs/5.3/assets/img/bootstrap-sponsoring.png
similarity index 100%
rename from site/static/docs/5.2/assets/img/bootstrap-sponsoring.png
rename to site/static/docs/5.3/assets/img/bootstrap-sponsoring.png

diff --git a/site/static/docs/5.2/assets/img/bootstrap-sponsoring@2x.png b/site/static/docs/5.3/assets/img/bootstrap-sponsoring@2x.png
similarity index 100%
rename from site/static/docs/5.2/assets/img/bootstrap-sponsoring@2x.png
rename to site/static/docs/5.3/assets/img/bootstrap-sponsoring@2x.png

diff --git a/site/static/docs/5.2/assets/img/services/browserstack.svg b/site/static/docs/5.3/assets/img/services/browserstack.svg
similarity index 100%
rename from site/static/docs/5.2/assets/img/services/browserstack.svg
rename to site/static/docs/5.3/assets/img/services/browserstack.svg

diff --git a/site/static/docs/5.2/assets/img/services/netlify.svg b/site/static/docs/5.3/assets/img/services/netlify.svg
similarity index 100%
rename from site/static/docs/5.2/assets/img/services/netlify.svg
rename to site/static/docs/5.3/assets/img/services/netlify.svg