Follow-up to #171: rebrand README + (optional) rename GitHub repo to BattWatch — do AFTER the relaunch

[almothafar]

Split out from the rebrand issue (#171) deliberately so it does not interrupt the current in-flight work. Do this only after the relaunch issues have landed — it's cosmetic/branding cleanup, not a blocker.

Scope A — README + docs rebrand (always do)

Rename the repo's public-facing docs to BattWatch, keeping a "formerly Simple Battery Notifier" line for continuity and search:

• README.md — title (L1), the "Why" section (L10, L14), clone instructions (L69-70). Overlaps with Fill out the Installation section of README.md #3 (Installation section) and Add screenshots to README.md #2 (screenshots) — coordinate so the README is refreshed once.
• CODE_REVIEW_GUIDELINES.md — project-name mention (L3).

Scope B — optional GitHub repo rename (owner's call)

Renaming almothafar/SimpleBatteryNotifier → almothafar/BattWatch for brand consistency (repo = app = store).

Why it's safe: GitHub auto-redirects the old URL, clone URLs, and old issue/PR links indefinitely — including every f4460ac permalink in these issues. The redirect only breaks if a new repo later reuses the old name (don't do that). Not required functionally; purely branding.

If renamed, update the URL references that currently hardcode the repo name (so they point straight at the new name instead of leaning on the redirect):

• strings.xml L284 — about_github_url
• strings.xml L360 — feedback_github_url
• README.md L3, L111 — CI badge + Actions links
• settings.gradle L15 — rootProject.name (cosmetic: changes the Gradle project + default build-output name; optional)
• Update the F-Droid metadata name too (ties to Publish SimpleBatteryNotifier in F-Droid #4).

Leave alone: strings.xml L255 developer_link = github.com/almothafar — that's your profile, not the repo.

Do NOT touch — the package identity

This rename is URLs and docs only. The Java package path and app identity stay exactly as they are:

• applicationId = com.almothafar.simplebatterynotifier and namespace (app/build.gradle L35, L40) — changing applicationId = brand-new Play listing, zero installs/reviews (the whole reason Rebrand to BattWatch: app display name + Play Store listing (title / short / long description) #171 keeps it).
• Every com.almothafar.simplebatterynotifier.* reference in the layout/pref XML tools:context, fragment names, and custom-view tags — these follow the package, not the repo, and must not change.

Renaming the repo does not require touching any of these — repo name and package name are independent.

(Permalinks pinned at f4460ac; they keep resolving through GitHub's redirect even after a repo rename.)

Acceptance criteria

• README + guidelines read as BattWatch, with a "formerly Simple Battery Notifier" note
• If repo renamed: about_github_url, feedback_github_url, README badge/links updated; F-Droid metadata name updated (Publish SimpleBatteryNotifier in F-Droid #4)
• applicationId, namespace, and all com.almothafar.simplebatterynotifier.* references untouched
• Old links verified still redirecting (spot-check one issue permalink post-rename)

Follow-up to #171. Related: #2, #3 (README refresh), #4 (F-Droid name).