[Docs] Add link to AlpineConf talk (#1062)

[skip azp]

Author: giordano

docs/src/FAQ.md

@@ -60,7 +60,7 @@ or develop it with
 ]dev https://github.com/MY_USERNAME/Libfoo_jll.jl.git
 ```
 
-Since this package is unregistered, you have to use the full [`PackageSpec`](https://julialang.github.io/Pkg.jl/stable/api/#Pkg.PackageSpec) specification to add it as dependency of the local builder for `Quxlib`:
+Since this package is unregistered, you have to use the full [`PackageSpec`](https://julialang.github.io/Pkg.jl/v1/api/#Pkg.PackageSpec) specification to add it as dependency of the local builder for `Quxlib`:
 
 ```julia
     Dependency(PackageSpec(; name = "Libfoo_jll",  uuid = "...", url = "https://github.com/MY_USERNAME/Libfoo_jll.jl.git"))

docs/src/index.md

@@ -61,3 +61,4 @@ BinaryBuilder has been covered in some videos, you may want to check them out if
 * [Introduction to BinaryBuilder.jl](https://www.youtube.com/watch?v=d_h8C4iCzno): live building session by Mosè Giordano (2020-04-10)
 * [BinaryBuilder.jl - The Subtle Art of Binaries That Just Work](https://www.youtube.com/watch?v=3IyXsBwqll8): JuliaCon 2020 workshop by Elliot Saba and Mosè Giordano to guide users through the use of BinaryBuilder (2020-07-25)
 * [Your first BinaryBuilder.jl recipe with Julia](https://www.youtube.com/watch?v=7fkNcdbt4dg): live building by Miguel Raz Guzmán Macedo (2021-04-07)
+* [BinaryBuilder.jl — The Subtle Art of Binaries That "Just Work"](https://bbb.dereferenced.org/playback/presentation/2.3/75a49eebcb63d6fee8c55417ea7cc51768d86f3d-1621065511930): AlpineConf 2021 talk by Elliot Saba and Mosè Giordano, starts at 4:19:00 (2021-05-15)