Minor changes to the new exp config forms

[becky-gilbert]

This PR includes some suggested minor changes to the new separate "Study Ad" and "Study Details" forms (#1244):

• In studies/templates/studies/experiment_runner/base.html I put the content inside of a div with the row class so that the spacing between the content and breadcrumbs matches that in other pages (studies/templates/studies/study_edit.html, studies/templates/studies/study_create.html).
• Added a period to the end of a paragraph.
• In the EFP edit form, I switched the order of the 'protocol structure' and 'protocol generator' fields because the protocol structure is the one that came first before and that most researchers will use (I think).
• Made the checkbox border darker for the 'Use protocol generator' option, to make it more visible.
• Modified the link in the EFP commit SHA help text so that the page opens in a new tab.
• Added the BS5 'fw-bold' class to the form labels on the EFP and External forms, to make them more visible and to match the labels on the study ad form.

Study details - before:

Study details - after changes in this PR:

Study ad (not changed, just for reference):

Also tagging @mekline for review of these changes, since some of my suggestions might contradict her requests.

[bleonar5]

These seem like sensible formatting changes

[okaycj]

@becky-gilbert Thanks for the updates. I you want, you can always ask for these changes in the original PR. I never mind making these small changes or at least talking about them. Once I get the other PR into develop, I'll rebase this and get it in as well.

[sonarcloud]

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