Initialize //blog with lorri

To create new posts, I run...
```shell
hugo new name-of-post.md
```

While writing posts, I run...
```shell
hugo serve -D
```

I need hugo available on PATH environment variable, which lorri provides.

1 files changed, 2 insertions, 0 deletions

diff --git a/blog/.envrc b/blog/.envrc
new file mode 100644
index 000000000000..b80e28b4b815
--- /dev/null
+++ b/blog/.envrc
@@ -0,0 +1,2 @@
+source_up
+eval "$(lorri direnv)"