FINERACT-2269: various small dev-focused improvements

remove unnecessary javadoc html5 option

html5 output is the default since at least Java 17

improve markdown formatting for PR template

fix casing, per GH recommendations

https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository recommends lowercase

document system default Java issues

reorder integration test hints importance-wise

make devRun the default

It's faster and more obviously useful for developers.

See https://lists.apache.org/thread/zxvtx9nqqbojvt0dd65tk8zd4xp6ot0t

mention gradle not re-running tests

remove Gitpod

per James, Ádám, and Victor, this is no longer used/supported

for setting up a local dev environment see the top-level README.md and https://fineract-academy.com

build.gradle

@@ -739,13 +739,6 @@ configure(project.fineractJavaProjects) {
     tasks.withType(Javadoc) {
         options.addStringOption('Xdoclint:none', '-quiet')
         options.encoding = 'UTF-8'
-        // FIXME - html5 is the default since sometime before Java 17
-        // Disable strict checking to prevent build failures on invalid javadoc
-        options.addBooleanOption('html5', true)
-        // Add this if you're using Java 21 records or other modern features
-        if (JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_21)) {
-            options.addBooleanOption('html5', true)
-        }
         // Ignore any errors during javadoc generation
         failOnError = false
     }