Bump addressable from 2.7.0 to 2.8.0 in /docs

Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/sporkmonger/addressable/releases)
- [Changelog](https://github.com/sporkmonger/addressable/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sporkmonger/addressable/compare/addressable-2.7.0...addressable-2.8.0)

---
updated-dependencies:
- dependency-name: addressable
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     activesupport (3.2.22.5)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     coffee-script (2.4.1)
       coffee-script-source
@@ -252,7 +252,6 @@ GEM
     unf_ext (0.0.7.7)
     unf_ext (0.0.7.7-x64-mingw32)
     unicode-display_width (1.7.0)
-    wdm (0.1.1)
 
 PLATFORMS
   ruby
@@ -261,7 +260,6 @@ PLATFORMS
 DEPENDENCIES
   github-pages
   tzinfo-data
-  wdm (~> 0.1.0)
 
 BUNDLED WITH
    2.1.4