_content/.well-known: revert register libera.chat project

These files were never served correctly but the libera.chat folks have
verified that the CL was merged (and presumably intended to be
displayed) and the project now has all the required permissions.

This reverts commit 7150aade441d21b06ee1a0634f02b985b0a67a95.

Change-Id: I74f10bd9899abaf8c189cc2fde2ac316ca584cd3
GitHub-Last-Rev: f2dca522865b97f4d74a604579f2c3f8b18aba8f
GitHub-Pull-Request: golang/website#61
Reviewed-on: https://go-review.googlesource.com/c/website/+/327251
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Trust: Heschi Kreinick <heschi@google.com>
Trust: Ian Lance Taylor <iant@golang.org>
diff --git a/_content/.well-known/libera/index.html b/_content/.well-known/libera/index.html
deleted file mode 100644
index 7e85a54..0000000
--- a/_content/.well-known/libera/index.html
+++ /dev/null
@@ -1 +0,0 @@
-I'm registering with Libera libera-registration-ticket=903