Minor typo on website

[teonbrooks]

Very cool project. Just noticed two typos, one of which is rendered on https://omnom.zone/:

availibilty -> availability

omnom/templates/index.tpl

Line 13 in cf9c76b

Create self-contained snapshots for every bookmark you save.<br/> Access &amp; share previously visited pages without worrying about modifications or availibilty.

omnom/README.md

Line 6 in cf9c76b

Access & share previously visited pages without worrying about modifications or availibilty.