Hashtags rendered in templates create incorrect links to tag pages

[Maarrk]

Hashtags rendered in templates create incorrect links to tag pages (they include < > in the address). Related to #1072 and
Found by @mjf in https://community.silverbullet.md/t/my-first-hours-with-sb/743/9?u=maarrk, a minimal example below:

#tag1 #<second tag>

```template
{{#each tags}}
#<{{.}}>
{{/each}}
```

Probably need to change a slice(1) into extractHashtag (introduced by #1116) somewhere in template rendering chain.