Point the Vidora entry at the project website

[romainGouraud]

The Vidora entry (added in #43) currently links to its Chrome Web Store listing rather than to the project website, which is the convention used by the other entries in the list.

Two small fixes in this change:

• The link now points to https://getvidora.com. The previous Chrome Web Store URL also used an outdated slug that now serves a 301.
• The description is trimmed and corrected. The old wording claimed Bunny CDN support "out of the box", which overstates it: the project's own compatibility page lists Bunny as partial. The "Free tier available" mention was also misleading, since the extension is currently free in full.

Description kept to two sentences and ending with a period, per the contribution guidelines.