Relace node-sass with dart-sass

This patchset moves phosphor-webui away from node-sass.  This is a good
thing overall, and should make phosphor-webui build a little faster,
given it doesn't have to compile libsass.  It also dumps a significant
number of dependencies from the tree.

webui-vue has a similar patch:
https://gerrit.openbmc-project.xyz/c/openbmc/webui-vue/+/35663

Tested:
Build phosphor-webui with changes.  Builds as expected.

Change-Id: I30537284518ebf2e0816568e25320a55ade323e4
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/package-lock.json b/package-lock.json
index 5608491..eefc3af 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -11021,7 +9965,8 @@
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
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 }
diff --git a/package.json b/package.json
index fd51898..f44d0fd 100644
--- a/package.json
+++ b/package.json
@@ -76,11 +76,10 @@
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