* ui: remove the divider between heatmap and feeds in the dashboard view

* this commit reverses 6ccd19ef86

Signed-off-by: surtur <a_mirre@utb.cz>

* add a divider to the default user dashboard view

* another one-line change, this time as a direct complement of
  2bfc71614c to implement a divider of
  sorts (as per 6ccd19ef86 originally)

Signed-off-by: surtur <a_mirre@utb.cz>

* removed the divider in heatmap.tmpl

* the separator is added by partial templates as needed

Signed-off-by: surtur <a_mirre@utb.cz>

* load proper dashboard template code in profile.tmpl

* as discussed in Discord
* includes a divider of its own

Signed-off-by: surtur <a_mirre@utb.cz>

* Split dashboard elements into separate template files

No code change just Move Heatmap and Repo list/search into separate
template files (like feeds and navbar already are). This will let a
user more easily replace dashboard.tmpl without regularly becoming
out of sync with fixes or changes to the actual code.

Fixes #10870

* End file with an empty line

Co-authored-by: zeripath <art27@cantab.net>