WriteFreely ActivityPub mentions testing

Trying out ActivityPub mentions which are available since v0.12.0rc1.

Should be using gollowing handles:

My name is Gytis Repečka, I am Data Engineer currently working with PostgreSQL and Linux infrastructure on AWS cloud. Writing code in SQL, Go and Bash. Experienced data professional (Teradata, Informatica) with focus on Inmon's data warehousing architecture (10 years). I enjoy using, promoting and contributing to open source software and love communicating about tech to both advanced and non-tech people. Visit Inretio for consulting services. Mention me @gytis@mastodon.lt on Mastodon.