Fix applications page

Closes #25, #27, #28, and #26

See merge request xiph/xspf-website!4

Implement validation page. Re-enable link to it in header.

Closes #20

See merge request xiph/xspf-website!3

fix: JSPF page 404

Closes #21

See merge request xiph/xspf-website!2

Implement validation page. Re-enable link to it in header. Fixes https://gitlab.xiph.org/xiph/xspf-website/-/issues/20

Create page for json. Fixes https://gitlab.xiph.org/xiph/xspf-website/-/issues/21 "JSPF page has gone 404"

good at last?

See merge request xiph/xspf-website!1

Will have to do without compiled SCSS as I don't have it installed on new computer