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chore: add Mastodon link

Changed files
+1
+1
config.toml
···
main_menu = [
{url="https://plan.cat/~hauleth", name=".plan", rel="me"},
{url="https://twitter.com/hauleth", name="twitter", rel="me"},
+
{url="https://fosstodon.org/@hauleth", name="mastodon", rel="me"},
{url="https://github.com/hauleth", name="github", rel="me"},
{url="https://gitlab.com/hauleth", name="gitlab", rel="me"},
]