Add accessibility details for sprint venue (#1364)

As a couple of people have requested this for the Beginners' Day, I've
added the accessibility information about the sprints venue to both the
Beginners' Day page and the accessibility page.

Co-authored-by: Mia Bajić <[email protected]>

Author: t-redactyl

src/content/pages/accessibility.mdx

@@ -186,7 +186,9 @@ Please have a look at the [accessibility information](/social-event/#accessibili
 
 The sprints and unconference will take place at a [different venue](/venue#where-1) than the main conference.
 
-Accessibility information for this venue will be provided soon.
+The main entrance to the building is accessible for wheelchair users via a platform (the entrance from the main road). If you choose to enter the building via the operational-side reception from the Vltava, then there is access along a straight line and slightly up a hill. The spaces are connected by an elevator that also leads to -1, where there is a wheelchair toilet.
+
+Assistance dogs are allowed in the venue, but other dogs will need to be left at home.
 
 {/*
 

src/content/pages/beginners-day.mdx

@@ -67,6 +67,10 @@ This workshop is also designed for people with no previous knowledge of Python o
 
 Just bring a laptop, and you'll leave with practical skills to begin your data science journey.
 
-We are also looking for **mentors** for Django Girls. Applications for mentors close on **July 4th**.
+## Accessibility
+
+The venue for the Beginners Day is accessible.
+
+The main entrance to the building is accessible for wheelchair users via a platform (the entrance from the main road). If you choose to enter the building via the operational-side reception from the Vltava, then there is access along a straight line and slightly up a hill. The spaces are connected by an elevator that also leads to -1, where there is a wheelchair toilet.
 
-<Button url="https://docs.google.com/forms/d/e/1FAIpQLSd3o8nMC_vdM0RJAnUbwOQa7JamDrEzKW4AHjTkqhjndWznmg/viewform?usp=dialog">Become a Humble Data Mentor!</Button>
+Assistance dogs are allowed in the venue, but other dogs will need to be left at home.