Move everything to apps/desktop subdirectory

Some bits will need to be moved back out after the merge

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

apps/desktop/dockerbuild/Dockerfile

@@ -0,0 +1,24 @@
+# Docker image to facilitate building Element Desktop's native bits using a glibc version (2.31)
+# with broader compatibility, down to Debian bullseye & Ubuntu focal.
+FROM rust:bullseye@sha256:16950191527a4cb9e0762d9d48b705a6315158e4035e64f7a93ce8656a1b053c
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get -qq update && apt-get -y -qq dist-upgrade && \
+  apt-get -y -qq install --no-install-recommends \
+  # tclsh is required for building SQLite as part of SQLCipher
+  tcl \
+  # Used by seshat (when not SQLCIPHER_STATIC) \
+  libsqlcipher-dev && \
+  apt-get purge -y --auto-remove && rm -rf /var/lib/apt/lists/*
+RUN ln -s /usr/bin/python3 /usr/bin/python & ln -s /usr/bin/pip3 /usr/bin/pip
+
+ENV DEBUG_COLORS=true
+ENV FORCE_COLOR=true
+
+WORKDIR /project
+
+ARG TARGETOS
+ARG TARGETARCH
+COPY .node-version dockerbuild/setup.sh /
+RUN /setup.sh